Dust collecting attachment

A dust collecting attachment comprising:

• a dust suction portion opposed to a surface of a workpiece, a tip tool being allowed to pass through the dust suction portion;
• and
• a main body having a dust collection passage communicated with the dust suction portion and connectable to an external hose;
• wherein
• the dust suction portion has a negative pressure by exerting a suction force to the dust collection passage from the hose,
• the dust suction portion includes:
• an inner pipe through which the tip tool passes;
• a first dust suction flow passage that opens a first suction opening to a side of the workpiece in an outside in a radial direction of the inner pipe and is communicated with the dust collection passage;
• and
• a second dust suction flow passage that opens a second suction opening to an opposite side of the workpiece in the outside in the radial direction of the inner pipe and is communicated with the dust collection passage.