Police received a call at about 10:45 a.m. reporting a robbery at the Bonfare Market in the 3500 block of Willow Pass Road, Lt. Jim Lardieri said.
Two males in their late teens or early 20s entered the store, pointed a gun at the clerk and demanded cash, police said.
They left the store with an undisclosed amount of money and were seen driving away in a tan, mid-size car, Lardieri said.
Anyone with information about the case is asked to call the Concord Police Department at (925) 671-3333. People who wish to remain anonymous can call the Police Department's tip line at (925) 603-5836 or Bay Area Crime Stoppers at (800) 222-8477.