To provide a storage unit with a storing space which enables a user to utilize the storing space efficiently and to store and take in and out stored objects smoothly, and to provide furniture with a cabinet where the storage unit is put.

A storage unit is made up of door frames 1, 1', 2, 2', and inner frames 3, 3', 4, 4' which are placed in a manner that each of the inner frames crosses the door frames respectively. A storing space which can be taken in and out is made by installing sliding frames parallel with the inner frames on the top and the bottom of the inner frames. Furniture has a cabinet with the built-in, storage unit.