An impact tool which performs a hammering operation on a workpiece by at least linear movement of a tool bit in an axial direction of the tool bit, comprising: a driving mechanism (110, 143) for driving the tool bit, a housing part (105, 106) that forms a housing space in which at least part of the driving mechanism (110, 143) is disposed, and a switching member for switching a drive mode of the impact tool, wherein: the switching member has an operating member that is operated by a user for mode switching, and a biasing member (175; 181) that is disposed between the operating member and the housing part (105, 106) and biases the operating member so as to hold the operating member in a selected position, the biasing member (175; 181) is disposed in the housing space, and the housing part (105, 106) is provided with a through hole through which the operating member is inserted, the operating member has a large-diameter portion having a larger diameter than the through hole, and the large-diameter portion is disposed in the housing space and supports the biasing member (175; 181), characterized in that the biasing member (175; 181) is a leaf spring, and the leaf spring (175; 181) is installed in an installation space formed as a recess in a rear portion of the through hole, which recess is open to the housing space on the inner side of the housing part and open on a side facing the through hole. a driving mechanism (110, 143) for driving the tool bit, a housing part (105, 106) that forms a housing space in which at least part of the driving mechanism (110, 143) is disposed, and a switching member for switching a drive mode of the impact tool, wherein: the switching member has an operating member that is operated by a user for mode switching, and a biasing member (175; 181) that is disposed between the operating member and the housing part (105, 106) and biases the operating member so as to hold the operating member in a selected position, the biasing member (175; 181) is disposed in the housing space, and the housing part (105, 106) is provided with a through hole through which the operating member is inserted, the operating member has a large-diameter portion having a larger diameter than the through hole, and the large-diameter portion is disposed in the housing space and supports the biasing member (175; 181), characterized in that the biasing member (175; 181) is a leaf spring, and the leaf spring (175; 181) is installed in an installation space formed as a recess in a rear portion of the through hole, which recess is open to the housing space on the inner side of the housing part and open on a side facing the through hole. the switching member has an operating member that is operated by a user for mode switching, and a biasing member (175; 181) that is disposed between the operating member and the housing part (105, 106) and biases the operating member so as to hold the operating member in a selected position, the biasing member (175; 181) is disposed in the housing space, and the housing part (105, 106) is provided with a through hole through which the operating member is inserted, the operating member has a large-diameter portion having a larger diameter than the through hole, and the large-diameter portion is disposed in the housing space and supports the biasing member (175; 181), characterized in that the biasing member (175; 181) is a leaf spring, and the leaf spring (175; 181) is installed in an installation space formed as a recess in a rear portion of the through hole, which recess is open to the housing space on the inner side of the housing part and open on a side facing the through hole.