To provide a mold structure for die casting and injection molding, whose degassing valve or vacuum decompressing means is prevented from being clogged when filling a mold cavity with molten metal or the like by discharging gas in the cavity with the degassing valve or by evacuating the inside of the mold cavity.

The mold structure for die casting and injection molding (the mold structure 50) has a cavity and a degassing runner 5 formed in a mold body 1. A space 4 is structured in the mold body 1 so as to intersect with the degassing runner 5. An opening/closing member 20, in which a degassing hole 21 capable of communicating with a part of the degassing runner 5 is formed, is mounted on the space 4. The state of the opening /closing member 20 can be switched to the state (the opening state) that a degassing groove 21 of the member 20 communicates with the degassing runner 5, or to the state (the closing state) that a part of the member 20 other than the degassing groove 21 closes the degassing runner 5, by rotating/sliding the member 20.