Among actuator materials, photomechanical crystals deform upon light irradiation, making them attractive as lightweight and remotely controllable actuators. Previous studies have primarily reported on the free deformation of these crystals, revealing various deformation behaviors . When the deformation contacts an object, it can exert force and perform work . The maximum force is generated when the free deformation is perfectly blocked, which is defined as the blocking force, a key performance indicator for actuators. Due to the small size of the crystals and the difficulty of constructing experimental setup, blocking force measurements for photomechanical crystals have been rare. In our previous research, we developed an experimental system that allowed us to directly measure the blocking force of photomechanical crystals .