A cleaner includes a housing provided to receive a fan motor unit configured to generate a suction force and a dust collecting chamber provided to collect foreign substances, a suction head coupled to a lower portion of the housing to suck the foreign substances on a surface to be cleaned, a neck arranged between the suction head and the housing to connect the suction head to the housing, the neck rotatable with respect to the suction head and detachably coupled to the housing, a switch device arranged on one side of the neck to allow the neck and the housing to be coupled to each other or separated from each other, and a rotating body rotatably coupled to the neck and configured to lock or unlock the switch device according to a position of the neck with respect to the suction head.