PURPOSE: To carry out attachment to a plurality of arms in different type and curry out the attachment easily without requiring much time and labor.

CONSTITUTION: A first attachment hole 4 at the front end of an arm 1 and a first connecting hole 5 of a clamp type bucket body 3 are connected with a first connecting pin 6. A connecting protuberance 7 provided to a claw 2 is connected with a second connecting pin 10 to a second attachment hole 9a of a connecting link 9 that is provided so that it can project beyond a cylinder rod 8a and swing freely. A connecting hole 12b on one end of a connecting hinge 12 that is connected at the other end thereof to a connecting plate 11 with a pin is connected to a third connecting pin 14 inserted into a third attachment hole 13. A fitting part 15 is provided on the upper end of the connecting plate 11. The fitting part 15 is formed in a semicircular arc with a part connected with a pin to the first connecting hole 12b as its fulcrum, and a part of its circumference is brought into contact with the outer face of the third connecting pin 14. The lower edge of the second connecting hole 12b is arranged in agreement with the position of the outer periphery of the fitting part 15.