Method for producing gel-like member

The invention provides a manufacturing method capable of efficiently manufacturing a thin gel-like member with a uniform thickness. First, a first assembly step is performed, a first flexible member covers a horizontal first plate-shaped member, and a frame-shaped spacer plate is disposed on the first flexible member. After the first assembly step, an injection step is performed in which the liquid gel material is injected into the inner side of the spacer plate. A second assembly step is performed after the injection step, a second flexible member of the liquid gel material covering the inside of the spacer plate is covered on the spacer plate, and a second plate-like member covers the second flexible member. And a gelation step for gelating the gel material while pressurizing the first plate-shaped member and the second plate-shaped member in the direction facing each other after the second assembly step. And a demolding step of sequentially removing the second plate-like member, thesecond flexible member,