Surveillance footage released by the Fresno Police Department shows the suspect walking into a store on Olive and Crystal Avenues on June 14.
The man held up a gun to the clerk and demanded money from the register, police say.
In the video, the suspect can be seen wearing a hooded sweater and a bandanna over his face.
Authorities are now asking for the public's help identifying the suspect. Anyone with information is asked to call the Fresno Police Department.