To provide a countertop reinforcement structure of a counter kitchen, which is capable of improving appearance quality and reducing costs without exposing reinforcement metal fittings to the outside or using a cover member.

In the counter kitchen where a countertop overhangs from a back surface of a cabinet body, a reinforcement member for supporting an overhung part of the countertop is concealed by a vertical panel and liner spacer of the countertop. The reinforcement member comprises L type metal fittings, vertical pieces of the L type metal fittings are placed between installation reinforcement grids, and horizontal pieces are placed between base materials of the liner spacer.