The objective of the present invention is to provide a radiation device in which the turning properties of a front wheel can be maintained while the straight travel stability of a rear wheel can be ensured. The invention, which is provided with a radiation generation part 50, an arm part 40 to which the radiation generation part 50 is attached, a support member 30 to which the arm part 40 is rotatably connected, a body part 20 to which the support member 30 is connected, and a leg part 10 on which the body part 20 is mounted, is configured such that: the leg part 10 has a first caster 10a, which is provided to the front side of the leg part 10 so as to be capable of turning, and a second caster 10b, which is provided to the rear side of the leg part 10 so as to be capable of turning the wheel diameter of the second caster 10b is larger than the wheel diameter of the first caster 10a and with the arm part 40 rotated to a state in which the radiation generation part 50 is positioned furthest to the bottom in the vertical direction, the center of gravity of the device as a whole is further to the second caster 10b side than the center which is between the first caster 10a and the second caster 10b.Linvention a pour objet de fournir un dispositif dexposition à un rayonnement qui tout en préservant les propriétés de rotation de roues avant, permet dassurer la stabilité de progression rectiligne de roue arrière. Lobjet de linvention est équipé : dune partie génération de rayonnement (50) dune partie bras (40) sur laquelle est installée la partie génération de rayonnement (50) dun élément de support (30) auquel est connectée la partie bras (40) de manière à lui permettre de tourner dune partie corps principal (20) à laquelle est connectée lélément de support (30) et dune partie pied (10) sur laquelle est montée la partie corps principal (20). La partie pied (10) possède des premières roulettes (10a) agencées de manière à permettre une rotation côté avant de la partie p
