Handheld power tool, and working method using handheld power tool and working program

A handheld power tool that detects a metal contained in a target and performs work on the target, the handheld power tool comprising:

• a main body;
• an arm portion which is attached to the main body in a state that allows forward and backward thereof;
• a detection signal acquisition unit configured to acquire a detection signal which changes according to a detection intensity of the metal contained in the target;
• a determination unit configured to determine a presence or absence of the metal on the basis of an acquisition result acquired by the detection signal acquisition unit;
• a display unit having a-light emitter and a substantially annular substrate, configured to display the presence or absence of the metal by turning on different lights, the light emitter that is disposed on the substrate, facing toward an opening formed in a center of the substrate, the display unit being disposed at a distal end of the arm portion;
• a display control unit configured to control the display unit so as to switch a color of the light displayed on the display unit on the basis of a determination result from the determination unit;
• a drive unit configured to rotationally drive a tip tool that performs work on the target;
• and
• a drive control unit configured to control a drive of the drive unit, wherein
• when the determination unit has determined that the metal is absent, the drive control unit permits the drive of the drive unit,
• the display control unit controls the display unit so as to emit auxiliary light that illuminates a portion to be worked by the tip tool, and
• the opening of the display unit is served as a work hole into which the tip tool is inserted.