It is an object of the present invention to provide a circuit unit accommodation box having receptacles, with the circuit unit accommodation box being able to reliably accommodate a circuit unit having a first connector and also allowing the worker to attach the circuit unit to the circuit unit accommodation box with a simple operation when the circuit unit is to be accommodated in the circuit unit accommodation box. The circuit unit accommodation box includes a box body and a receptacle. The box body includes at least one circuit unit accommodating recess into which a circuit unit, equipped with a first connector, is inserted. The receptacle is disposed in the circuit unit accommodating recess and provides an electrical connection with the inserted circuit unit. The box body and the circuit unit are equipped with a securing mechanism for holding the circuit unit in the box body when the circuit unit is inserted from a first position to a second position.