To provide a bag with casters that can reduce damages to free rollers, spin the free rollers smoothly, and move to any direction without any difficulty even when a strong shock load is applied to the bag body.

A bag with rollers is moved by free rollers 1 placed on four corners in a state that a bag body 3 stands by itself. The free rollers 1 are provided with wheels 6, yokes 7 that connect the wheels 6 in a rotatable manner, radial bearings 8 that connect the yokes 7 with external wheels 8B, pivot shafts 9 that are connected to internal wheels 8A of the radial bearings 8, and fixing sections 10 that fix the upper part of the pivot shafts 9. The pivot shafts 9 spin yokes 7 by arranging rotating shafts 11 at eccentric places from center shafts m of rotation. The yokes 7 and the fixing sections 10 are provided with gaps 15 to prevent deformation, that come close and face each other and when a bending impulse force is applied to the pivot shafts 9 the gaps 15 to prevent a deformation make the yokes 7 and the fixing sections 10 pressed with each other to support the bending impulse force.