A washing machine comprising: a tub to accommodate washing water; a pump case in which a washing water inflow chamber and a drain pump chamber are provided, so as to drain washing water in the tub; a pump filter that filters foreign substances in washing water flowing from the tub and is able to be detached from the pump case; and a pump filter head that is combined with one side of the pump filter and causes the pump filter to rotate in at least one of a clockwise direction and a counterclockwise direction, wherein the pump filter head comprises: a first head having a first state in which the first head is engaged with one side of the pump case and is combined with the pump case and a second state in which the first head is released from the pump case, wherein the first state is established by rotating the first head in a first direction when the first head is in the second state; and a second head that is positioned at front of the first head and is rotatable separately from the first head in the first state, characterized in that the first head comprises at least one first head protrusion part provided at an inner side of the first head so as to protrude from a direction of the second head, and the second head comprises at least one second head protrusion part provided at an inner side of the second head so as to protrude from a direction of the first head such that, after establishing the first head in the first state, subsequent rotation of the second head with respect to the first head in the first direction causes the first head and the second head to generate auditory and tactile stimulus due to contact between the at least one second head protrusion part and the at least one first head protrusion part. a tub to accommodate washing water; a pump case in which a washing water inflow chamber and a drain pump chamber are provided, so as to drain washing water in the tub; a pump filter that filters foreign substances in washing water flowing from the tub and is able to be detached from the pump case; and a pump filter head that is combined with one side of the pump filter and causes the pump filter to rotate in at least one of a clockwise direction and a counterclockwise direction, wherein the pump filter head comprises: a first head having a first state in which the first head is engaged with one side of the pump case and is combined with the pump case and a second state in which the first head is released from the pump case, wherein the first state is established by rotating the first head in a first direction when the first head is in the second state; and a second head that is positioned at front of the first head and is rotatable separately from the first head in the first state, characterized in that the first head comprises at least one first head protrusion part provided at an inner side of the first head so as to protrude from a direction of the second head, and a first head having a first state in which the first head is engaged with one side of the pump case and is combined with the pump case and a second state in which the first head is released from the pump case, wherein the first state is established by rotating the first head in a first direction when the first head is in the second state; and a second head that is positioned at front of the first head and is rotatable separately from the first head in the first state, the second head comprises at least one second head protrusion part provided at an inner side of the second head so as to protrude from a direction of the first head such that, after establishing the first head in the first state, subsequent rotation of the second head with respect to the first head in the first direction causes the first head and the second head to generate auditory and tactile stimulus due to contact between the at least one second head protrusion part and the at least one first head protrusion part.