[Problem] To provide a technology for improving the usability of an impact tool. [Solution] A hammer drill (100) has a main housing (101) in which a motor housing (103) is united with a gear housing (105). An electric motor (110) is fixed in the motor housing (103). Meanwhile, a movement-converting mechanism (120) that is the impact mechanism section, an impact element (140) and a tool holder (159) are housed in the gear housing (105) so as to be capable of moving relative to the gear housing (105). During impact work, the impact mechanism section, on which the biasing force of a coil spring (171) is acting, moves relative to the gear housing (105) and vibrations generated by the impact work are reduced.