But she added in an interview with Elle magazine appearing Friday that in the 1970s, when the crime occurred, society viewed sex and drugs in a different light.
"My personal truth is that Roman is a marvelous husband and man," said actress Emmanuelle Seigner, 43. "He is an impeccable man and I have nothing to reproach him for."
The 76-year-old Polanski, who has two young children, is fighting extradition to the United States. The director was initially accused of raping a 13-year-old girl after plying her with champagne and a Quaalude pill during a 1977 modeling shoot. He pleaded guilty to unlawful sexual intercourse, then fled to France on the eve of sentencing in 1978.
"My husband never believed he was above the law. The proof is that he pleaded guilty...," she said.
Polanski was arrested in Switzerland on his way to a film festival in September. He was jailed for more than 60 days before being placed under house arrest Dec. 4 in Gstaad, Switzerland.
The woman who was the child victim at the time, Samantha Geimer, is supporting a motion by Polanski's lawyers urging that the director be sentenced to time served then - 42 days in a California prison for psychiatric evaluation.
Geimer's attorney, Lawrence Silver, faxed that position to other lawyers Wednesday, asking that Polanski be sentenced in absentia.
The director's wife said the 1970s were a "crazy time."
"The relationship to drugs wasn't the same, the relationship to sexual liberty and permissiveness neither," she said. "Today, public opinion has considerably evolved on the subjects."
Seigner described her personal horror after her husband's arrest.
She said she has had the impression of "falling into a well like Alice in Alice in Wonderland," and that each day the fall has been "slow and regular ... and this long fall won't stop."
Switzerland has not yet decided whether to honor the extradition request.
