A washing machine includes a casing, an exterior container disposed within the casing, configured to store washing water for washing, and supported to the casing, and a suspension module disposed between the exterior container and the casing and configured to buffer a vibration transferred from the exterior container to the casing. The suspension module includes a holder disposed between a horizontal suspension and a vertical suspension and configured to generate a relative movement in a length direction and to perform buffering on a vibration in a direction that crosses the length direction when the vibration is reduced.