diff --git a/Sources/Photochk/Views/GroupDetailView.swift b/Sources/Photochk/Views/GroupDetailView.swift
new file mode 100644
index 0000000..8cc89ee
--- /dev/null
+++ b/Sources/Photochk/Views/GroupDetailView.swift
@@ -0,0 +1,57 @@
+import SwiftUI
+
+struct GroupDetailView: View {
+    @Bindable var model: ScanViewModel
+    let group: SimilarityGroup
+
+    private let columns = [GridItem(.adaptive(minimum: 168, maximum: 168), spacing: 18, alignment: .top)]
+
+    var body: some View {
+        ScrollView {
+            LazyVGrid(columns: columns, alignment: .leading, spacing: 20) {
+                ForEach(group.members) { member in
+                    PhotoTileView(
+                        member: member,
+                        isRepresentative: member.id == group.representativeID,
+                        isMarked: model.markedForDeletion.contains(member.id),
+                        canMark: model.canMark(member.id, in: group),
+                        onToggle: { model.toggleMark(member.id, in: group) }
+                    )
+                }
+            }
+            .padding(20)
+        }
+        .safeAreaInset(edge: .top) { header }
+        .navigationTitle(group.representative.fileName)
+        .navigationSubtitle("\(group.members.count) 枚")
+    }
+
+    private var header: some View {
+        VStack(alignment: .leading, spacing: 4) {
+            HStack(spacing: 8) {
+                Text(group.kindText)
+                    .font(.caption.weight(.semibold))
+                    .padding(.horizontal, 7)
+                    .padding(.vertical, 2)
+                    .background(
+                        group.isAllExact ? Color.orange.opacity(0.22) : Color.accentColor.opacity(0.18),
+                        in: Capsule()
+                    )
+                Text("\(group.members.count) 枚・合計 \(group.totalBytesText)")
+                Text("1枚残すと \(group.reclaimableBytesText) 削減")
+                    .foregroundStyle(.secondary)
+            }
+            .font(.callout)
+
+            Text(group.representative.url.deletingLastPathComponent().path)
+                .font(.caption)
+                .foregroundStyle(.tertiary)
+                .lineLimit(1)
+                .truncationMode(.head)
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+        .padding(.horizontal, 20)
+        .padding(.vertical, 10)
+        .background(.bar)
+    }
+}