To provide a radiation panel that can be laid in short time, and to provide a method for laying the same.

A radiation panel 1 includes a panel body 2A serving as a radiation surface; a pipe mat 3A arranged on a rear surface 21a side of the panel body 2A and in which a heat medium flows; an attachment member 4A for attaching the panel body 2A to an existing ceiling; and a pressing member 5 for pressing the pipe mat 3A onto the rear surface 21a side of the panel body 2A.