diff --git a/backend/app/controllers/wiki_assets_controller.rb b/backend/app/controllers/wiki_assets_controller.rb
new file mode 100644
index 0000000..dfb8cf8
--- /dev/null
+++ b/backend/app/controllers/wiki_assets_controller.rb
@@ -0,0 +1,38 @@
+require 'digest'
+
+
+class WikiAssetsController < ApplicationController
+  def index
+    page_id = params[:wiki_page_id].to_i
+    page = WikiPage.find_by(id: page_id)
+    return head :not_found unless page
+
+    render json: page.assets
+  end
+
+  def create
+    return head :unauthorized unless current_user
+    return head :forbidden unless current_user.gte_member?
+
+    wiki_page_id = params[:wiki_page_id].to_i
+    page = WikiPage.find_by(id: wiki_page_id)
+    return head :not_found unless page
+
+    file = params[:file]
+    return head :bad_request if file.blank?
+
+    page.with_lock do
+      no = page.next_asset_no
+      alt_text = params[:alt_text].presence
+      sha256 = Digest::SHA256.file(file.tempfile.path).digest
+
+      asset = WikiAsset.new(wiki_page_id:, no:, alt_text:, sha256:, created_by_user: current_user)
+      asset.file.attach(file)
+      asset.save!
+
+      page.update!(next_asset_no: no + 1)
+    end
+
+    render json: asset
+  end
+end
diff --git a/backend/app/models/wiki_asset.rb b/backend/app/models/wiki_asset.rb
new file mode 100644
index 0000000..4fb5d66
--- /dev/null
+++ b/backend/app/models/wiki_asset.rb
@@ -0,0 +1,10 @@
+class WikiAsset < ApplicationRecord
+  self.primary_key = :wiki_page_id, :no
+
+  belongs_to :wiki_page
+  belongs_to :created_by_user, class_name: 'User'
+
+  has_one_attached :file
+
+  validates :file, presence: true
+end
diff --git a/backend/app/models/wiki_page.rb b/backend/app/models/wiki_page.rb
index 1573127..b752599 100644
--- a/backend/app/models/wiki_page.rb
+++ b/backend/app/models/wiki_page.rb
@@ -15,6 +15,8 @@ class WikiPage < ApplicationRecord
            foreign_key: :redirect_page_id,
            dependent: :nullify
 
+  has_many :assets, class_name: 'WikiAsset', dependent: :destroy
+
   belongs_to :tag_name
   validates :tag_name, presence: true
 
diff --git a/backend/config/routes.rb b/backend/config/routes.rb
index 57eb470..e53bef5 100644
--- a/backend/config/routes.rb
+++ b/backend/config/routes.rb
@@ -41,6 +41,8 @@ Rails.application.routes.draw do
       get :exists
       get :diff
     end
+
+    resources :assets, controller: :wiki_assets, only: [:index, :create]
   end
 
   resources :posts, only: [:index, :show, :create, :update] do
diff --git a/backend/db/migrate/20260323192300_create_wiki_assets.rb b/backend/db/migrate/20260323192300_create_wiki_assets.rb
new file mode 100644
index 0000000..1a4e875
--- /dev/null
+++ b/backend/db/migrate/20260323192300_create_wiki_assets.rb
@@ -0,0 +1,16 @@
+class CreateWikiAssets < ActiveRecord::Migration[8.0]
+  def change
+    create_table :wiki_assets, primary_key: [:wiki_page_id, :no] do |t|
+      t.references :wiki_page, null: false, foreign_key: true, index: false
+      t.integer :no, null: false
+      t.string :alt_text
+      t.column :sha256, 'binary(32)', null: false
+      t.references :created_by_user, null: false, foreign_key: { to_table: :users }
+      t.timestamps
+    end
+
+    add_index :wiki_assets, [:wiki_page_id, :sha256], unique: true
+
+    add_column :wiki_pages, :next_asset_no, :integer, null: false, default: 1
+  end
+end
diff --git a/backend/db/schema.rb b/backend/db/schema.rb
index 6a2096b..7dbc388 100644
--- a/backend/db/schema.rb
+++ b/backend/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2026_03_17_015000) do
+ActiveRecord::Schema[8.0].define(version: 2026_03_23_192300) do
   create_table "active_storage_attachments", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "name", null: false
     t.string "record_type", null: false
@@ -239,6 +239,18 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_17_015000) do
     t.datetime "updated_at", null: false
   end
 
+  create_table "wiki_assets", primary_key: ["wiki_page_id", "no"], charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
+    t.bigint "wiki_page_id", null: false
+    t.integer "no", null: false
+    t.string "alt_text"
+    t.binary "sha256", limit: 32, null: false
+    t.bigint "created_by_user_id", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["created_by_user_id"], name: "index_wiki_assets_on_created_by_user_id"
+    t.index ["wiki_page_id", "sha256"], name: "index_wiki_assets_on_wiki_page_id_and_sha256", unique: true
+  end
+
   create_table "wiki_lines", charset: "utf8mb4", collation: "utf8mb4_0900_ai_ci", force: :cascade do |t|
     t.string "sha256", limit: 64, null: false
     t.text "body", null: false
@@ -254,6 +266,7 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_17_015000) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.datetime "discarded_at"
+    t.integer "next_asset_no", default: 1, null: false
     t.index ["created_user_id"], name: "index_wiki_pages_on_created_user_id"
     t.index ["discarded_at"], name: "index_wiki_pages_on_discarded_at"
     t.index ["tag_name_id"], name: "index_wiki_pages_on_tag_name_id", unique: true
@@ -320,6 +333,8 @@ ActiveRecord::Schema[8.0].define(version: 2026_03_17_015000) do
   add_foreign_key "user_ips", "users"
   add_foreign_key "user_post_views", "posts"
   add_foreign_key "user_post_views", "users"
+  add_foreign_key "wiki_assets", "users", column: "created_by_user_id"
+  add_foreign_key "wiki_assets", "wiki_pages"
   add_foreign_key "wiki_pages", "tag_names"
   add_foreign_key "wiki_pages", "users", column: "created_user_id"
   add_foreign_key "wiki_pages", "users", column: "updated_user_id"