A van veered off of West Fairview Avenue and into the Pancake House on Monday, sending two men to St. Alphonsus Regional Medical Center in Boise.
Boise Police are investigating what caused the accident, which was reported at 3:13 p.m.
The driver and another man, both believed to be in their 20s, were taken to the hospital with non-life-threatening injuries, police said. Four people were in the van.
The crash caused structural damage to a corner of the building. It was not immediately clear how serious the damage was.
The Pancake House, a breakfast restaurant, was not open at the time of the crash. Tuesday morning it remained closed; the franchise owner could not be immediately reached for comment.