[Problem to be solved] To provide a compact case built-in with a hinge unit that can be easily assembled while reducing manufacturing costs of parts.[Solving Means] A compact case 1 with a lid body 20 connected, in an openable and closable manner, via a hinge using at least one or more hinge unit 30, to a back end of a flat box shaped container body 10, the compact case includes a frame body 41 of a plate-like member having a flat shape along a peripheral shape of an upper opening of the container body, the back end of the container body is formed with a hinge storing section 11 for storing a case section of the hinge unit so that a shaft section of the hinge unit is protruded, a back end of the lid body is formed with a receiving hole 21a in which the shaft section of the hinge unit is to be inserted, the frame body is attached to the container body so as to cover up the hinge storing section, the shaft section of the hinge unit is inserted in the receiving hole in a state the case section of the hinge unit is fixed to the container body, and the container body and the lid body are connected in an openable and closable manner.