Abstract: A multicolor molding method including: sandwiching, between a first cavity member having a through hole and a second cavity member, a substrate film on which an in-mold layer is formed so that the in-mold layer is positioned between the through hole and the second cavity member, the second cavity member closing one of openings of the through hole; disposing a core in a primary cavity formed of at least the through hole and injecting a first molding material into the primary cavity, to mold a primary molding layer on a surface of which the in-mold layer is transferred; and disposing the core in a secondary cavity and injecting a second molding material into the secondary cavity, to mold a secondary molding layer that covers the in-mold layer, the core being provided with the primary molding layer.

Abstract: The invention provides a resin-sealing apparatus that is operated with a low pressure and with a low clamping force without void generation and that is favorable for shortening the molding time and reduction of sealing resin consumption. In the resin-sealing apparatus of the present invention, a resin injection inlet of a pot has an opening at the center of the cavity surface of a cavity of a bottom mold that is a component of a mold unit, and a plunger for injecting molten resin in the pot from the opposite side to the resin injection inlet side is provided slidably and airtightly with the inside wall of the pot.