A frame structure for a pressing apparatus, the frame structure comprising: a C-shaped frame that is configured by combining a lower frame, an intermediate frame, a first upper frame and a second upper frame, which are formed of a metal, in substantially a C shape in which a front side in the forward and rearward direction and both sides in the leftward and rightward direction are open, wherein the intermediate frame disposed in the upward and downward direction, and has a lower end portion that is coupled to a rear end portion of the lower frame, characterized in that the first upper frame is disposed in the forward and rearward direction, and has a rear end portion that is coupled to an upper end portion of the intermediate frame and a front end portion disposed below the rear end portion and the second upper frame is disposed in the forward and rearward direction, and has a front end portion that is coupled to a front end portion of the first upper frame, an upper action section supported by and fixed to a lower surface of the rear end portion of the second upper frame; and a lower action section supported movably with respect to the front end portion of the lower frame in the upward and downward direction while being disposed below the upper action section, wherein, when a reaction force is applied through the upper action section, the C-shaped frame is deformed elastically and the intermediate frame, the first upper frame and the second upper frame each are pivoted about a leftward and rightward direction axis (Z 1, Z 2, Z 3), the C-shaped frame is formed such that the pivotal movement of the second upper frame is counter-rotating to the pivotal movements of the intermediate frame and the first upper frame, such that a displacement of the upper action section in the forward and rearward direction, which occurs according to the elastic deformation of the C-shaped frame, is canceled out and such that a displacement of the pivotal movement about its leftward and rightward direction axis of the upper action section is canceled out. a C-shaped frame that is configured by combining a lower frame, an intermediate frame, a first upper frame and a second upper frame, which are formed of a metal, in substantially a C shape in which a front side in the forward and rearward direction and both sides in the leftward and rightward direction are open, wherein the intermediate frame disposed in the upward and downward direction, and has a lower end portion that is coupled to a rear end portion of the lower frame, characterized in that the first upper frame is disposed in the forward and rearward direction, and has a rear end portion that is coupled to an upper end portion of the intermediate frame and a front end portion disposed below the rear end portion and the second upper frame is disposed in the forward and rearward direction, and has a front end portion that is coupled to a front end portion of the first upper frame, an upper action section supported by and fixed to a lower surface of the rear end portion of the second upper frame; and a lower action section supported movably with respect to the front end portion of the lower frame in the upward and downward direction while being disposed below the upper action section, wherein, when a reaction force is applied through the upper action section, the C-shaped frame is deformed elastically and the intermediate frame, the first upper frame and the second upper frame each are pivoted about a leftward and rightward direction axis (Z 1, Z 2, Z 3), the C-shaped frame is formed such that the pivotal movement of the second upper frame is counter-rotating to the pivotal movements of the intermediate frame and the first upper frame, such that a displacement of the upper action section in the forward and rearward direction, which occurs according to the elastic deformation of the C-shaped frame, is canceled out and such that a displacement of the pivotal movement about its leftward and rightward direction axis of the upper action section is canceled out.