A portable cutting machine, comprising: a cutting blade having a disk-like shape and configured to cut a cutting target through a rotational motion about a central axis; a cutting machine body configured to rotatably support the cutting blade; a protection cover covering a portion in a circumferential direction of the cutting blade and exposing a portion other than the portion in the circumferential direction of the cutting blade, the protection cover including an attachment part to be attached to the cutting machine body so as to be turnable about the central axis; the attachment part having a cylindrical shape extending around the central axis; an elastic member disposed on an outer circumferential surface of the attachment part; a fastening tool configured to fasten the elastic member to the attachment part and kept from turning about the central axis with respect to the cutting machine body; wherein the fastening tool includes a screw, and a fastening force is adjustable through rotation of the screw; wherein the fastening tool includes a band that surrounds the elastic member, and a fastening force of the band is changeable through the rotation of the screw; wherein the band includes a first projecting piece and a second projecting piece projecting radially outward and circumferentially spaced apart from each other, the first projecting piece and the second projecting piece including a first insertion hole and a second insertion hole, respectively, into which the screw is inserted; wherein the screw is inserted from the first insertion hole to the second insertion hole, and is screwed into a nut located on a side of the second projecting piece opposite to the first projecting piece; the cutting machine body includes a housing recess for housing the first projecting piece, the second projecting piece, the screw, and the nut; and wherein the first projecting piece, the second projecting piece, the screw and the nut project radially outward beyond the band, and engage with an inner surface of the housing recess. a cutting blade having a disk-like shape and configured to cut a cutting target through a rotational motion about a central axis; a cutting machine body configured to rotatably support the cutting blade; a protection cover covering a portion in a circumferential direction of the cutting blade and exposing a portion other than the portion in the circumferential direction of the cutting blade, the protection cover including an attachment part to be attached to the cutting machine body so as to be turnable about the central axis; the attachment part having a cylindrical shape extending around the central axis; an elastic member disposed on an outer circumferential surface of the attachment part; a fastening tool configured to fasten the elastic member to the attachment part and kept from turning about the central axis with respect to the cutting machine body; wherein the fastening tool includes a screw, and a fastening force is adjustable through rotation of the screw; wherein the fastening tool includes a band that surrounds the elastic member, and a fastening force of the band is changeable through the rotation of the screw; wherein the band includes a first projecting piece and a second projecting piece projecting radially outward and circumferentially spaced apart from each other, the first projecting piece and the second projecting piece including a first insertion hole and a second insertion hole, respectively, into which the screw is inserted; wherein the screw is inserted from the first insertion hole to the second insertion hole, and is screwed into a nut located on a side of the second projecting piece opposite to the first projecting piece; the cutting machine body includes a housing recess for housing the first projecting piece, the second projecting piece, the screw, and the nut; and wherein the first projecting piece, the second projecting piece, the screw and the nut project radially outward beyond the band, and engage with an inner surface of the housing recess.