A vehicle acceleration suppression device that suppresses acceleration of a vehicle depending on an operation amount of a driving force instruction element that instructs a driving force by operation of a driver to perform a suppression control of the driving force, the vehicle acceleration suppression device comprising: a driving force operation amount detector configured to detect a driving force operation amount which is the operation amount of the driving force instruction element; an acceleration controller configured to control acceleration of the vehicle depending on the driving force operation amount detected by the driving force operation amount detector; a peripheral environment recognizer configured to recognize a peripheral environment of the vehicle based on detection information of a peripheral environment recognition sensor provided in the vehicle; a vehicle travel state detector (10B, 10C, 10D, 10F, 10G, 10H) configured to detect a travel state of the vehicle; a vehicle travel direction detector (20, 10E) configured to detect a travel direction of the vehicle; a parking frame entering certainty degree calculation unit configured to set a parking frame entering certainty degree indicating a degree of certainty that the vehicle enters a parking frame based on the environment recognized by the peripheral environment recognizer and the travel state detected by the vehicle travel state detector (10B, 10C, 10D, 10F, 10G, 10H); and an acceleration suppression unit (42, 44, 10J, 10K) configured to suppress the acceleration controlled by the acceleration controller based on the parking frame entering certainty degree set by the parking frame entering certainty degree calculation unit and the travel direction detected by the travel direction detector (20, 10E), the vehicle acceleration suppression device being characterized in that when the travel direction detected by the vehicle travel direction detector (20, 10E) is forward, the acceleration suppression unit (42, 44, 10J, 10K) is configured to set a suppression degree of the acceleration of the vehicle to be lower than when the travel direction detected by the travel direction detector (20, 10E) is backward. a driving force operation amount detector configured to detect a driving force operation amount which is the operation amount of the driving force instruction element; an acceleration controller configured to control acceleration of the vehicle depending on the driving force operation amount detected by the driving force operation amount detector; a peripheral environment recognizer configured to recognize a peripheral environment of the vehicle based on detection information of a peripheral environment recognition sensor provided in the vehicle; a vehicle travel state detector (10B, 10C, 10D, 10F, 10G, 10H) configured to detect a travel state of the vehicle; a vehicle travel direction detector (20, 10E) configured to detect a travel direction of the vehicle; a parking frame entering certainty degree calculation unit configured to set a parking frame entering certainty degree indicating a degree of certainty that the vehicle enters a parking frame based on the environment recognized by the peripheral environment recognizer and the travel state detected by the vehicle travel state detector (10B, 10C, 10D, 10F, 10G, 10H); and an acceleration suppression unit (42, 44, 10J, 10K) configured to suppress the acceleration controlled by the acceleration controller based on the parking frame entering certainty degree set by the parking frame entering certainty degree calculation unit and the travel direction detected by the travel direction detector (20, 10E), the vehicle acceleration suppression device being characterized in that when the travel direction detected by the vehicle travel direction detector (20, 10E) is forward, the acceleration suppression unit (42, 44, 10J, 10K) is configured to set a suppression degree of the acceleration of the vehicle to be lower than when the travel direction detected by the travel direction detector (20, 10E) is backward.