The legal guardian is a businessman, 48, who earns over SEK 60,000 per year, according to newspaper Metro.
"We will contact the 72-year-old's legal guardian and demand an explanation. You are not supposed to have 60 to 70 clients," said Kennet Öhlund, head of the Public Trustee Office (Överförmyndarförvaltningen) in Stockholm.
Police have also launched an investigation into conditions at the Vårbacka Plaza home, which is run by healthcare company Aleris.
"If there are any shortcomings in patient safety, we will take immediate action," Aleris spokesman Jonas Lundqvist told Metro.