A cleaning tool, having a cleaning sheet and a holder for holding the cleaning sheet, wherein: the cleaning tool has a longitudinal direction in which the holder is inserted into the cleaning sheet; a transverse direction crossing the longitudinal direction; a transverse direction center point which is a center point on the cleaning tool in the transverse direction; a longitudinal center line which is a line passing through the transverse direction center point in parallel to the longitudinal direction; an outside direction which is a direction away from the transverse direction center point on the cleaning tool; and an inside direction which is a direction toward the transverse direction center point on the cleaning tool, the cleaning sheet has an insertion part into which the holder is inserted, the holder includes a holding part having a pair of extending parts which is inserted into the insertion part of the cleaning sheet, a first outermost part of the holding part which projects most in the outside direction in the transverse direction, a projection which is formed in the outside direction in the holding part, a second outermost part of the projection which projects most in the outside direction in the transverse direction, and a grip part which is connected to the holding part and designed to be held by a user, characterized in that a first outermost virtual line which is a shortest line connecting the longitudinal center line and the first outermost part and a second outermost virtual line which is a shortest line connecting the longitudinal center line and the second outermost part are formed, and the first outermost virtual line is longer than the second outermost virtual line. the cleaning tool has a longitudinal direction in which the holder is inserted into the cleaning sheet; a transverse direction crossing the longitudinal direction; a transverse direction center point which is a center point on the cleaning tool in the transverse direction; a longitudinal center line which is a line passing through the transverse direction center point in parallel to the longitudinal direction; an outside direction which is a direction away from the transverse direction center point on the cleaning tool; and an inside direction which is a direction toward the transverse direction center point on the cleaning tool, the cleaning sheet has an insertion part into which the holder is inserted, the holder includes a holding part having a pair of extending parts which is inserted into the insertion part of the cleaning sheet, a first outermost part of the holding part which projects most in the outside direction in the transverse direction, a projection which is formed in the outside direction in the holding part, a second outermost part of the projection which projects most in the outside direction in the transverse direction, and a grip part which is connected to the holding part and designed to be held by a user, characterized in that a first outermost virtual line which is a shortest line connecting the longitudinal center line and the first outermost part and a second outermost virtual line which is a shortest line connecting the longitudinal center line and the second outermost part are formed, and the first outermost virtual line is longer than the second outermost virtual line.