Provided are a heat exchanger apparatus and a heat source unit that are for use in a chiller unit. The heat exchanger apparatus comprises at least one heat exchanger module (100). The heat exchanger module (100) comprises two heat exchanger units (10 and 20) that are oppositely fitted with each other. At least one between the two heat exchanger units (10 and 20) is bent so that an angle between adjacent two edges (c and d) on at least one extremity of the two heat exchanger units (10 and 20) is less than an angle between main parts (12 and 22) of the two heat ex- changer units (10 and 20), thus increasing the area for heat exchange.
