Abstract: A portable cleaner can be inserted into a pocket or a bag and removes unwanted substances, such as dust, from clothes or surroundings. The portable cleaner includes an adhesive sheet that removes the unwanted substances, and is reusable by being washed with water. The portable cleaner has a base to be gripped by a user's hand; a gel-type adhesive sheet on a front side of the base; a front case covering the adhesive sheet when the cleaner is not used; and a rear case attached to a rear surface of the base. An attachment point with respect to the base is formed apart from a back side thereof by a gap into which the user's finger is inserted. An attachment prevention member that does not stick to the adhesive sheet has a size corresponding to the adhesive sheet and is attached to an inner surface of the front case.