A door-equipped housing includes a box body having an opening formed on one side thereof, and a door to close the opening, the door being supported by the box body to be rotatable about a rotational axis. The box body has a projecting portion formed on an inside of a wall of the box body extending from the opening toward a deep side of the box body. The door includes a hook portion to engage the projected portion for preventing the door from opening, the hook portion being located on a deeper side of the box body than the projecting portion as the door closes the opening, and a flexible part extending in a direction away from a surface of the wall having the projected portion formed thereon as the door closes the opening. The flexible part bends together with a movement of the hook portion to climb over the projecting portion during an opening/closing operation of the door.