A cleaner comprising: a dust canister provided in a body and configured to collect dust therein; a cover rotatably coupled to the body to open and close the dust canister; a filter assembly mounted inside the dust canister to be exposed when the cover is opened, and configured to filter dust from air flowing along an inner flow path of the body; and characterized in that said cleaner further comprises: a crevice tool connectable to an air entrance of the body or an extension pipe connected to the air entrance, wherein the filter assembly comprises: an opening opened toward the cover; and a protrusion protruding from an inner circumferential surface of the opening, wherein the crevice tool comprises a locking rib (194a, 194b) caught on the protrusion as the crevice tool is inserted into the opening and rotated, and the filter assembly is drawn out of the dust canister together with the crevice tool by a force for pulling the crevice tool out of the dust canister while the locking rib (194a, 194b) is locked on the protrusion, and wherein the locking rib (194a, 194b) comprises: a position setting portion (194a1) extending along a direction that the crevice tool is inserted and drawn out; and a locking portion (194a2) extending in a direction intersecting with the position setting portion (194a1) and locked on the protrusion. a dust canister provided in a body and configured to collect dust therein; a cover rotatably coupled to the body to open and close the dust canister; a filter assembly mounted inside the dust canister to be exposed when the cover is opened, and configured to filter dust from air flowing along an inner flow path of the body; and characterized in that said cleaner further comprises: a crevice tool connectable to an air entrance of the body or an extension pipe connected to the air entrance, wherein the filter assembly comprises: an opening opened toward the cover; and a protrusion protruding from an inner circumferential surface of the opening, wherein the crevice tool comprises a locking rib (194a, 194b) caught on the protrusion as the crevice tool is inserted into the opening and rotated, and the filter assembly is drawn out of the dust canister together with the crevice tool by a force for pulling the crevice tool out of the dust canister while the locking rib (194a, 194b) is locked on the protrusion, and wherein the locking rib (194a, 194b) comprises: a position setting portion (194a1) extending along a direction that the crevice tool is inserted and drawn out; and a locking portion (194a2) extending in a direction intersecting with the position setting portion (194a1) and locked on the protrusion. a crevice tool connectable to an air entrance of the body or an extension pipe connected to the air entrance, wherein the filter assembly comprises: an opening opened toward the cover; and a protrusion protruding from an inner circumferential surface of the opening, wherein the crevice tool comprises a locking rib (194a, 194b) caught on the protrusion as the crevice tool is inserted into the opening and rotated, and the filter assembly is drawn out of the dust canister together with the crevice tool by a force for pulling the crevice tool out of the dust canister while the locking rib (194a, 194b) is locked on the protrusion, and wherein the locking rib (194a, 194b) comprises: a position setting portion (194a1) extending along a direction that the crevice tool is inserted and drawn out; and a locking portion (194a2) extending in a direction intersecting with the position setting portion (194a1) and locked on the protrusion. an opening opened toward the cover; and a protrusion protruding from an inner circumferential surface of the opening, wherein the crevice tool comprises a locking rib (194a, 194b) caught on the protrusion as the crevice tool is inserted into the opening and rotated, and the filter assembly is drawn out of the dust canister together with the crevice tool by a force for pulling the crevice tool out of the dust canister while the locking rib (194a, 194b) is locked on the protrusion, and wherein the locking rib (194a, 194b) comprises: a position setting portion (194a1) extending along a direction that the crevice tool is inserted and drawn out; and a locking portion (194a2) extending in a direction intersecting with the position setting portion (194a1) and locked on the protrusion. a position setting portion (194a1) extending along a direction that the crevice tool is inserted and drawn out; and a locking portion (194a2) extending in a direction intersecting with the position setting portion (194a1) and locked on the protrusion.