Power tool attachment and power tool

A power tool attachment used in a power tool that machines a workpiece by driving a tip tool to oscillate around a drive axis, the power tool attachment comprising:

• an attachment member detachably attached to the power tool;
• a restricting member configured to come into contact with an object and restrict relative movement of the power tool with respect to the object;
• and
• a coupling member configured to couple the restricting member and the attachment member, wherein
• the restricting member includes
• (i) a shaft portion, and
• (ii) a stopper portion coupled to a tip end of the shaft portion and having a restricting surface orthogonal to a long axis of the shaft portion, and
• the coupling member is configured to couple the restricting member and the attachment member to each other to cause the power tool attachment to be in a first state, the first state being a state in which the long axis of the shaft portion and the drive axis of the tip tool are parallel to each other when the attachment member is attached to the power tool.