A laundry treatment apparatus (100, 200) comprising: a housing comprising a reception space; a first through-hole configured to communicate with the reception space by penetrating a first surface of the housing; a second through-hole configured to communicate with the reception space by penetrating a second surface facing the first surface from a space provided by the housing; a first connection portion comprising a first connection body rotatably provided in the reception space, a first connection shaft inserted into the first through-hole, and a connection shaft through-hole formed to penetrate the first connection shaft; a second connection portion comprising a second connection body provided in the reception space to reciprocate between the first surface and the second surface, a fastening body provided in the second connection body to be detachably coupled to the first connection body, and a second connection shaft protruding from the second connection body toward the second through-hole; a drum configured to provide a space in which laundry is stored; a drum shaft, one end of which is fixed to the drum and the other end of which is inserted into the connection shaft through-hole, configured to interconnect the drum and the first connection shaft, so that the drum shaft can reciprocate along the path provided by the connection shaft through-hole and at the same time the rotational force of the first connection shaft can be transferred to the drum shaft; a driver comprising a driving shaft rotatably fixed to the second through-hole to form a concentric shaft along with the drum shaft, and a motor to rotate the driving shaft; a connection shaft fastening portion provided in the driving shaft to provide a space in which a free end of the second connection shaft is inserted, and configured to transmit rotational motion of the driving shaft to the second connection shaft; and a support configured to be elastically deformed between the second connection body and the second surface, and to provide force by which the second connection body is pressed in a direction in which the first connection body is disposed so that the first connection body is coupled to the fastening body. a housing comprising a reception space; a first through-hole configured to communicate with the reception space by penetrating a first surface of the housing; a second through-hole configured to communicate with the reception space by penetrating a second surface facing the first surface from a space provided by the housing; a first connection portion comprising a first connection body rotatably provided in the reception space, a first connection shaft inserted into the first through-hole, and a connection shaft through-hole formed to penetrate the first connection shaft; a second connection portion comprising a second connection body provided in the reception space to reciprocate between the first surface and the second surface, a fastening body provided in the second connection body to be detachably coupled to the first connection body, and a second connection shaft protruding from the second connection body toward the second through-hole; a drum configured to provide a space in which laundry is stored; a drum shaft, one end of which is fixed to the drum and the other end of which is inserted into the connection shaft through-hole, configured to interconnect the drum and the first connection shaft, so that the drum shaft can reciprocate along the path provided by the connection shaft through-hole and at the same time the rotational force of the first connection shaft can be transferred to the drum shaft; a driver comprising a driving shaft rotatably fixed to the second through-hole to form a concentric shaft along with the drum shaft, and a motor to rotate the driving shaft; a connection shaft fastening portion provided in the driving shaft to provide a space in which a free end of the second connection shaft is inserted, and configured to transmit rotational motion of the driving shaft to the second connection shaft; and a support configured to be elastically deformed between the second connection body and the second surface, and to provide force by which the second connection body is pressed in a direction in which the first connection body is disposed so that the first connection body is coupled to the fastening body.