To provide a floor panel for preventing a warp and increasing the strength, and a manufacturing method for the floor panel through which the floor panels having a uniform thickness can be mass-produced.

A tabular concrete panel body 2 is bonded to a metallic surface plate 3 coating the concrete panel body 2 through an adhesive 7 mixed with sand. A punched steel plate 4 as a reinforcing face member is stuck on the rear face side of the panel body 2. In this way, the metallic surface plate 3 and the concrete panel body 2 which are different kinds of materials from each other can be closely and firmly adhered and the strength can be improved.