diff --git a/Sources/Photochk/Views/ThumbnailView.swift b/Sources/Photochk/Views/ThumbnailView.swift
new file mode 100644
index 0000000..ff78fac
--- /dev/null
+++ b/Sources/Photochk/Views/ThumbnailView.swift
@@ -0,0 +1,35 @@
+import SwiftUI
+
+/// QuickLook のサムネイルを非同期で読み込んで表示する。
+struct ThumbnailView: View {
+    let url: URL
+    let size: CGFloat
+
+    @State private var image: NSImage?
+
+    /// 読み込み済みならキャッシュから直接描く。プレースホルダの一瞬のちらつきを防ぐ。
+    private var displayImage: NSImage? {
+        image ?? ThumbnailLoader.shared.cached(for: url, size: size)
+    }
+
+    var body: some View {
+        ZStack {
+            RoundedRectangle(cornerRadius: 6, style: .continuous)
+                .fill(.quaternary)
+
+            if let image = displayImage {
+                Image(nsImage: image)
+                    .resizable()
+                    .aspectRatio(contentMode: .fit)
+            } else {
+                ProgressView()
+                    .controlSize(.small)
+            }
+        }
+        .frame(width: size, height: size)
+        .clipShape(RoundedRectangle(cornerRadius: 6, style: .continuous))
+        .task(id: url) {
+            image = await ThumbnailLoader.shared.thumbnail(for: url, size: size)
+        }
+    }
+}