To provide a novel robot hand for taking gripping and releasing action adaptable to various shapes and types of works while maintaining a high holding force and achieving easy control and low manufacturing cost.

The robot hand comprises a palm member 10 having an installation reference plane S. The palm member 10 is composed of one moving type first robot finger 20a1 which is installed along one side 11 as part of the installation reference plane S in a position changeable manner, one moving type fourth robot finger 20a2 which is installed along the other side 12 opposed to one side 11 in a position changeable manner, and two fixed type fourth robot fingers 20b which are fixed and installed on the other side 12. Optimum gripping work can be performed by changing positions of the moving type first robot finger 20a1 and the moving type fourth robot finger 20a2 corresponding to the shape of a work to be gripped.