A cooling/heating panel has a planar radiation panel (12), a metallic holding member (18) arranged partially on a backside of the radiation panel (12), and a resin heat exchange pipe (16) held by the holding member (18). The holding member (18) has: a flat soaking plate (20) which is superimposed on the radiation panel (12); and a holding portion (22) which is erected on the soaking plate (20) and latches the heat exchange pipe (16). The heat exchange pipe (16) has an outside diameter larger than an inside diameter of the holding portion (22) before the heat exchange pipe (16) is attached to the holding portion (22) and in a state in which the heat exchange pipe (16) is attached to the holding portion (22), the holding portion (22) holds a side face of the heat exchange pipe (16) repulsively from both sides.