The figure, which has been released by the Electoral Commission, was criticised by the SNP’s opponents.
Conservative MSP Murdo Fraser said: “The SNP is behaving like leaving the EU is the end of the world for Scotland. But the party’s pitiful investment in the campaign tells another story completely.
“The SNP is not a poor organisation, yet it treated the EU referendum like it was a council by-election. Now we know Alex Neil and other senior SNP figures wanted Brexit, perhaps that explains why such little effort and cash was invested.”
SNP MSP Bill Kidd said that his party had run a “strong, positive and effective campaign”, which helped secure a 62 per cent Remain vote north of the Border.