It was lower than the previous worst attendance of 58,349 against Italy in 2002 when Wales were in another losing streak.
The cost of a match-day experience in Cardiff has been suggested as the reason for some fans staying away.
But the political turmoil in the domestic game, with the WRU looking to cut one region while facing a potential vote of no confidence among member clubs, is leaving disgruntled fans to turn away.
Before Sunday’s game, fans told BBC Sport the current crisis was “heartbreaking, sad and depressing” and many were no longer motivated to buy tickets.
Swansea council leader Rob Stewart, who has previously spoken out against the Welsh Rugby Union’s plans to potentially cut Ospreys, said fans were voting with their feet.
He said on social media: “It’s heart-breaking to see the Principality Stadium barely 3/4 full today. Much as we love our Wales team, fans are voting with their feet and staying away.
“Their message to the WRU is clear – we will stay away until you go away.”
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