There is provided a bath hot water supply apparatus capable of reliably supplying fine bubbles to a bathtub. The bath hot water supply apparatus includes: a circulation channel 15 that allows bath water led out of a bathtub to return to the bathtub a circulation pump that circulates the bath water a fine bubble generation device 16 that is provided on the circulation channel 15 and is capable of generating fine bubbles in the bath water and rectification means 31 that is provided in the circulation channel 15 downstream of the fine bubble generation device 16, and suppresses rotation of a swirl flow containing the fine bubbles generated by the fine bubble generation device 16, and the fine bubble generation device 16 generates the fine bubbles while the bath water is circulated to the circulation channel 15 to supply the fine bubbles to the bathtub.
