There is provided a curtain opening/closing device whose number of parts is reduced, which is lightened, whose safety and durability are improved, whose installation space is reduced, whose appearance is improved and which can be installed freely along a curved surface, and a vehicle carrying the curtain opening/closing device. The curtain opening/closing device comprises a spiral long coil member, a movable member capable of moving within the long coil member, a rail member rotably and loosely fitting the long coil member and having a slit continuous in a longitudinal direction and a rotational driving section fixed at one end of the rail member and rotating and driving the long coil member. The movable member is inserted within the long coil member so as to be movable in the longitudinal direction.