To provide a resin molding and a method for producing the same.

Provided is a resin molding in which two types of substrates have a connection part constituted of a thin part provided from the one substrate to the other substrate with a boundary defined by end surfaces of the respective substrates, wherein the density of the one substrate in the connection part is higher than the density of a base part excluding the connection part. The resin molding can have a configuration in which the one substrate is a plate-like substrate including reinforcing fibers and a first thermoplastic resin binding the reinforcing fibers to each other and the other substrate is an injection-molded member connected along the plate face direction of the one substrate from an end surface of the one substrate. Moreover, it is preferred that the connection part have, on the side thereof closer to the other substrate, a section gradually thinned from a position at which the connection part extends and the connection interface be located at an intermediate part of the part that is gradually thinned. It is preferred that the reinforcing fibers be plant fibers, such as kenaf.

To effectively prevent a breakage of a plate when a gasket body formed of a rubber-like elastic material is integrally molded at both faces of the plate formed of a brittle material such as carbon. In order to attain this object, there is provided a method of manufacturing a plate-integrated gasket in which a gasket body formed of a rubber-like elastic material is integrally formed at both sides of a portion along a peripheral edge of a plate in the thickness direction, where an area located between gasket molding cavities defined by clamping the plate between split dies of a metal mold in the plate is formed to be a relatively thick portion at a position, facing an opening of a gate through which a molding material is injected into the cavities, and in the vicinity thereof.