Embroidery frame (2) for holding an embroidering fabric in a spread-out is detachably attached to mounting members (6, 12) at a predetermined position. Positioning members (17, 18) are removably fixed to a base frame (1) at a predetermined position. The mounting members (6, 12) are attached to the positioning members (6, 12) in such a manner that their mounted positions relative to the positioning members (6, 12) are adjustable, so that the embroidery frame (2) is adjustably and removably mounted on the base frame (1) via the mounting members (6, 12) and the positioning members. Once the position of the mounting members relative to the positioning members has been established, and when the mounting members (6, 12) are to be detached from the base frame (1), the mounting members only have to be detached together with the positioning members (17, 18), so that the relative positional relationship between the adjusted positional state of the mounting members relative to the positioning members can be maintained and there is no need to repeat the mounted position adjustment of the mounting members.