Power tool

A power tool, comprising:

• a motor;
• a rotary shaft that is configured to be rotationally driven by the motor and that has a first end portion on a first direction side and a second end portion on a second direction side opposite to the first direction side in an axial direction of the rotary shaft;
• a housing that houses the rotary shaft and is configured to store a lubricant on the first direction side of the first end portion of the rotary shaft;
• and
• a driving mechanism and a final output shaft that is (i) configured to removably hold a tool accessory and (ii) parallel to the rotary shaft;
• wherein:
• the rotary shaft has:
• a first hole that (i) extends in the axial direction of the rotary shaft and (ii) has a first opening in the first end portion of the rotary shaft and a second hole that (i) extends in a direction crossing an axis of the rotary shaft, (ii) communicates with the first hole on the second direction side of the first opening, and (iii) has a second opening in an outer peripheral surface of the rotary shaft;
• a spiral part is in the first hole;
• the power tool has a hammer mechanism configured to produce at least hammering motion;
• the driving mechanism includes (i) the rotary shaft, (ii) a rotating body that is on the rotary shaft and that is configured to rotate integrally with the rotary shaft, and (iii) an oscillating body configured to oscillate in the axial direction of the rotary shaft in response to rotation of the rotating body;
• the driving mechanism is configured to linearly drive the tool accessory along an axis of the final output shaft in response to oscillation of the oscillating body;
• and
• the second opening is inside the rotating body.