A belt-type grinding tool comprising: a tool body including a motor; an idle pulley rotatably attached to the tool body; a drive pulley to be rotatably driven by the motor and having a cylindrical outer peripheral portion configured to support an endless grinding belt wound between the drive pulley and the idle pulley; a fan at least partially disposed radially inside the outer peripheral portion, the fan being configured to rotate together with the drive pulley to generate a flow of air passing through inside the outer peripheral portion in a direction of a rotation axis of the drive pulley; a cover having a cover plate portion disposed adjacent to one side end edge (28a, 28b) of the outer peripheral portion in the direction of the rotation axis, the cover defining between itself and the tool body an accommodating space accommodating the drive pulley, the cover plate portion having an inner opening portion and an outer opening portion, the inner opening portion opening into the accommodating space at a position radially inward of an inner peripheral surface of the outer peripheral portion, and the outer opening portion opening into the accommodating space at a position radially outward of the inner peripheral surface of the outer peripheral portion; and an airflow path provided in the accommodating space, the airflow path extending from the inner opening portion to pass through inside the outer peripheral portion and turning around an other side end edge (28a, 28b) of the outer peripheral portion to pass through outside the outer peripheral portion to reach the outer opening portion; wherein the airflow path is configured such that, when the fan is rotated, outside air is sucked into the accommodating space from one of the inner opening portion and the outer opening portion to flow along the airflow path and discharged to an outside of the accommodating space from the other of the inner opening portion and the outer opening portion. a tool body including a motor; an idle pulley rotatably attached to the tool body; a drive pulley to be rotatably driven by the motor and having a cylindrical outer peripheral portion configured to support an endless grinding belt wound between the drive pulley and the idle pulley; a fan at least partially disposed radially inside the outer peripheral portion, the fan being configured to rotate together with the drive pulley to generate a flow of air passing through inside the outer peripheral portion in a direction of a rotation axis of the drive pulley; a cover having a cover plate portion disposed adjacent to one side end edge (28a, 28b) of the outer peripheral portion in the direction of the rotation axis, the cover defining between itself and the tool body an accommodating space accommodating the drive pulley, the cover plate portion having an inner opening portion and an outer opening portion, the inner opening portion opening into the accommodating space at a position radially inward of an inner peripheral surface of the outer peripheral portion, and the outer opening portion opening into the accommodating space at a position radially outward of the inner peripheral surface of the outer peripheral portion; and an airflow path provided in the accommodating space, the airflow path extending from the inner opening portion to pass through inside the outer peripheral portion and turning around an other side end edge (28a, 28b) of the outer peripheral portion to pass through outside the outer peripheral portion to reach the outer opening portion; wherein the airflow path is configured such that, when the fan is rotated, outside air is sucked into the accommodating space from one of the inner opening portion and the outer opening portion to flow along the airflow path and discharged to an outside of the accommodating space from the other of the inner opening portion and the outer opening portion.