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1. An impact tool, comprising:
a housing body, having a recess; a motor housed in the housing body; a hammer casing, housing a rotatable spindle and an impact mechanism operable to convert the rotation of the spindle into intermittent impact actions in a first direction which is a circumferential direction of the spindle, and having an opened rear end, the hammer casing coupled to the housing body; a cap, coupled to the hammer easing so as to close the opened rear end and to rotatably support the spindle, the cap having a through hole receiving an output axis of the motor, thereby causing the output axis of the motor to couple with the spindle to transmit a rotation of the motor to rotate the spindle; a first engagement member formed on an outer face of the cap; a second engagement member formed on an inner face of the housing body and engaging with the first engagement member; a third engagement member formed on an outer face of the hammer casing; a fourth engagement member formed at the housing body and engaging with the third engagement member; an internal gear held to the hammer casing so as to be prevented from rotating, and a male thread formed on an outer periphery of a front end of the cap, the male thread being screwed into a female thread which is formed on an inner periphery of the opened rear end of the hammer casing, wherein: the cap includes a first section and a second section, the second section having a diameter smaller than a diameter of the first section, an outer periphery of the first section includes two straight edges parallel to each other, the second section is disposed between the first section and the front end of the cap, and the second section engages with a stage structure formed on an inner face of the recess.
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