To provide a movable room lamp of vehicle which can assume lighting with one room lamp with respect to a lighting position of a plurality of portions not being aligned on one straight line, therefore, can reduce the number of equipment of room lamps on a vehicle and can lower costs due to reduction in constitutional components.

A lamp body 20 on which a light source 22 is mounted, a lamp housing 30 which is equipped with a rail 32 for moving the lamp body 20 to a plurality of lighting positions to be set within a car room 11 and is fixed to a car body panel 12a and a self-travelling rack 40 having a body support part 42 to which the lamp body 20 is attached and being attached to the rail 32 so as to travel forward-reverse movably on the rail 32 by a forward reverse operation of one motor 44 mounted are provided, wherein the rail 32 includes a first rail on which the self-travelling rack 40 is movable in front-back direction of a vehicle and a second rail on which the self-travelling rack 40 is movable from the first track to a width direction of the vehicle and one or more lighting positions are set on respective rails of the first rail and the second rail.