It took up to five days after the abuse came to light before a report was filed and relatives were informed, according to SVT's Uppdrag Granskning programme broadcast on Wednesday evening.
The man accused of perpetrating the abuse is in his eighties and faced a court in Luleå in northern Sweden on Wednesday charge with abuse.
The elderly man denied the crimes.
The court ruled that he undergo a so-called Section 7-examination before the trial concludes. Section 7 refers to a personal examination by psychiatrists.
After finally having been informed of the abuse, the spouse of the female victim asked that she move accommodation but was told that it was not necessary.
"No, she said a manager. He would not be able to do anything," her husband told Uppdrag Granskning.
According to SVT, the nursing home has neither informed her husband nor her family that the man accused of perpetrating the abuse is still resident in the same department as the woman.
The head of the nursing home explained that it was not possible to divulge the information:
"No, not as it is two customers who are staying with us and there is a privacy issue. But we must ensure that this does not occur."
The responsible nurse at the home is also in agreement that the home is not at liberty to tell.
"We can not violate the Official Secrets Act."