The present invention relates to a washing machine and a microbubble generator thereof. According to an aspect of the present invention, the washing machine comprises: a cabinet; an outer tub accommodated inside the cabinet, and accommodating washing water; an inner tub accommodated inside the outer tub and accommodating laundry; a water supply valve unit provided in the cabinet and connected to an external water supply source to receive washing water; and a micro-bubble generator for generating micro-bubbles by receiving the washing water from the water supply valve unit, and supplying the same to a washing space. The micro-bubble generator includes a dissolution unit for dissolving gas in the washing water supplied from the water supply valve unit. The dissolution unit includes: a water supply line connection unit connected in a direction of the water supply valve unit to introduce the washing water; a supply hole for providing a path through which gas flows into a dissolution space formed therein; and a dissolved water discharge unit for discharging the washing water dissolved with the gas.
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