A grinder, comprising a motor, a housing that houses the motor, a spindle that projects from the housing and is driven by the motor, and thereby rotates relative to the housing, and a wheel cover that is disposed on an outer-circumference side of the spindle projecting from the housing and that is configured to cover a portion of a tool accessory attached to the spindle, wherein the housing includes a mounting portion, to which the wheel cover is attached, that has a circular-cylinder shape and that surrounds the spindle, and the wheel cover is configured to be externally fitted onto the mounting portion of the housing, the grinder further comprises at least one holding member (56A, 56B; 60A, 60B) configured as a separate structure from the wheel cover, the at least one holding member (56A, 56B; 60A, 60B) being configured to hold the wheel cover on the housing, the wheel cover and the at least one holding member (56A, 56B; 60A, 60B) are configured such that, in the state wherein the wheel cover is held on the housing by the at least one holding member (56A, 56B; 60A, 60B), the arrangement and position of the wheel cover around the spindle can be changed, and characterized in that the wheel cover comprises a circular-ring-shaped mounting part, the mounting part including an outwardly facing circumferential slit (54A, 54B), the at least one holding member (56A, 56B; 60A, 60B) comprises a rivet (60A, 60B) or a screw (56A, 56B) extending into the slit of the mounting part of the wheel cover, one end of the rivet (60A, 60B) or screw (56A, 56B) being fixed to the mounting portion of the housing and the other end of the rivet (60A, 60B) or screw (56A, 56B) having a head larger than a width of the slit (54A, 54B). a motor, a housing that houses the motor, a spindle that projects from the housing and is driven by the motor, and thereby rotates relative to the housing, and a wheel cover that is disposed on an outer-circumference side of the spindle projecting from the housing and that is configured to cover a portion of a tool accessory attached to the spindle, wherein the housing includes a mounting portion, to which the wheel cover is attached, that has a circular-cylinder shape and that surrounds the spindle, and the wheel cover is configured to be externally fitted onto the mounting portion of the housing, the grinder further comprises at least one holding member (56A, 56B; 60A, 60B) configured as a separate structure from the wheel cover, the at least one holding member (56A, 56B; 60A, 60B) being configured to hold the wheel cover on the housing, the wheel cover and the at least one holding member (56A, 56B; 60A, 60B) are configured such that, in the state wherein the wheel cover is held on the housing by the at least one holding member (56A, 56B; 60A, 60B), the arrangement and position of the wheel cover around the spindle can be changed, and characterized in that the wheel cover comprises a circular-ring-shaped mounting part, the mounting part including an outwardly facing circumferential slit (54A, 54B), the at least one holding member (56A, 56B; 60A, 60B) comprises a rivet (60A, 60B) or a screw (56A, 56B) extending into the slit of the mounting part of the wheel cover, one end of the rivet (60A, 60B) or screw (56A, 56B) being fixed to the mounting portion of the housing and the other end of the rivet (60A, 60B) or screw (56A, 56B) having a head larger than a width of the slit (54A, 54B).