WORK MACHINE

The invention provides a working machine capable of inhibiting dust generated by working from intruding into a bearing capable of rotatably supporting a main shaft and maintaining good working performance. The working machine is provided with: a gearbox; a main shaft protruding in a first direction from the gearbox; a bearing which is held by the gearbox, has an inner ring and an outer ring, and rotatably supports the main shaft; a tip tool attachment part which is provided on the main shaft and on which a tip tool can be attached; a seal member positioned closer to the first direction side than the bearing; and a restricting member that restricts the movement of the sealing member in the first direction, at least a portion of the sealing member overlaps the inner ring in the axial direction of the main shaft, and the restricting member is held by either the main shaft or the gearbox. 本发明提供一种作业机，能够抑制作业产生的粉尘侵入能够旋转地支撑主轴的轴承，良好地维持作业性。该作业机具备：齿轮箱；主轴，其从上述齿轮箱向第一方向突出；轴承，其保持于上述齿轮箱，具有内圈及外圈，且能够旋转地支撑上述主轴；前端工具安装部，其设置于上述主轴，