To provide a hand tool device maximally sucking dust particles.

This hand tool device includes a guide shoe 20 abutting on a processing material to be processed, a protection mechanism 30 for partially covering a cutoff tool or a grinding tool 11, a motor 13 driving the tool, and a ventilator 15 cooling the motor. A tool opening 26 for the tool is formed in the guide shoe, and the protection mechanism is provided with at least one hood-shaped protective element 31. At least one ventilation channel 21 is formed in the guide shoe, and at least one suction opening 22 is formed in the ventilation channel. The ventilation channel 21 communicates with the ventilator 15 through the suction opening. Further, in the ventilation channel 21, at least one blowout opening 23 is formed lateral to the tool opening 26.