Soria’s troubles began on Monday when Spanish online daily El Confidencial, which has had access to the Panama Papers — millions of files leaked from law firm Mossack Fonseca — said he was an administrator of an offshore firm in 1992.
Soria called a news conference to deny any link to the company, but as the week went by, more allegations emerged from other media outlets, revealing further alleged connections to offshore havens.
It is unclear as yet whether any of his alleged actions were illegal.
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Soria is the latest political victim of the Panama Papers leak, which revealed how the world’s wealthy stashed assets in offshore companies and which the law firm blamed on a computer hack.
Iceland’s Prime Minister Sigmundur David Gunnlaugsson was also forced to resign over the leaks.
In his statement, Soria said politics “is an activity that must always be exemplary, also where… explanations are concerned.”
“When that doesn’t happen, one must assume one’s responsibilities,” he added, in an indication that he was resigning due to how he had handled the revelations, rather than over any irregularities.