To provide an interior lighting device for a vehicle that prevents detachment of electric wires from a housing.
The interior lighting device for a vehicle is configured as follows. A bus bar 23 includes: switch connecting terminals 49 for connecting with a switch 22; roof harness connecting terminals 50 for connecting with a roof harness 38; and pressure contact terminal parts 51 with which each electric wire 57 is connected by crimping. The switch connecting terminals 49 are arranged to protrude to a clearance 39 for a switch of a housing 21. The pressure contact terminal parts 51 are arranged so as to protrude to the inside of electric wire holder attaching parts 108. A clamp member 43 is provided in the housing 21. A part of the clamp member 43 is cut out to form an electric wire mounting opening 44 for allowing the electric wire 57 pass through. The electric wire holder attaching parts 108 and the electric wire mounting opening 44 are arranged so as not to be aligned with a wiring direction of the electric wire 57. The electric wire 57 is clamped after passing them underneath the clamp member 43.