A laundry treatment apparatus includes a tub body for receiving water, a tub cover that covers an upper surface of the tub body and that defines an introduction aperture, a drum located inside the tub body for receiving laundry, a door for opening and closing the introduction aperture, a hinge that rotatably couples the door to the tub cover, a fixing unit that releasably couples a portion of the door to the tub cover, and a sealing unit on the door or the introduction aperture that is configured to seal the introduction aperture based on the introduction aperture being closed by the door. A portion of the sealing unit located in a direction in which the fixing unit is provided has a different diameter from a diameter of a portion of the sealing unit that is located in a direction in which the hinge is provided.