To provide a bag and a storing box, and a manufacturing method for the same, for achieving reduction of cost.

A first layer 42 made of ABS resin is stacked on a sheet-like cloth material 41 and a second layer 43 made of aluminum is stacked thereon to form a base material 44 in a base material forming process. The base material 44 is heated from the cloth material 41 side and fused so that the first layer 42 does not droop in a heating process. The base material 44 is pressed with an upper die 62 and a lower die 64 in a press process. A case body 11 formed by pressing is taken out of both molds and cooled in a cooling process.