Heat source unit with corrugated bottom plate

A heat source unit comprising:

• a corrugated plate forming a bottom frame in which ridges and furrows extend across a front and rear direction or across a right and left direction;
• and
• mounting feet comprising:
• supports that are in direct contact with and that support, from below, the furrows at supported ends of the bottom frame on sides that the ridges and the furrows can be seen;
• and
• walls disposed on outer sides of the supported ends and that extend from the supports in an upward direction from a level of the furrows toward the ridges, wherein
• each wall and each support on the same side of the bottom frame are directly and continuously connected at the level of the furrows,
• water drainage passages that drain water sticking to tops of the ridges at the supported ends to the supports are disposed above the supports, and
• the water drainage passages include openings formed in the ridges at the supported ends, and the openings oppose the supports from above.