A collision avoidance assistance apparatus including: a braking device (20, 21, 22) configured to generate a braking force in a driver's vehicle in response to a braking operation of a driver; obstacle detection means (50, 60) for detecting an obstacle around the driver's vehicle; automatic braking control means (10, 13) for performing, when determination is made that the driver's vehicle has a strong possibility of colliding with the obstacle, automatic braking control for avoiding collision between the driver's vehicle and the obstacle by generating the braking force with the braking device (20, 21, 22) without the braking operation of the driver; and automatic braking prohibition means (10, 14) for prohibiting the automatic braking control when determination is made that an accelerator operation index value is equal to or larger than an operation threshold, the accelerator operation index value having a correlation with an accelerator operation of the driver, the collision avoidance assistance apparatus being characterised by comprising: specific type determination means (10, 16) for determining whether a type of the obstacle is a specific type set in advance; and restriction means (10, 15) for restricting, when determination is made that the type of the obstacle is the specific type, an operation of the automatic braking prohibition means (10, 14) such that the automatic braking prohibition means (10, 14) does not prohibit the automatic braking control. a braking device (20, 21, 22) configured to generate a braking force in a driver's vehicle in response to a braking operation of a driver; obstacle detection means (50, 60) for detecting an obstacle around the driver's vehicle; automatic braking control means (10, 13) for performing, when determination is made that the driver's vehicle has a strong possibility of colliding with the obstacle, automatic braking control for avoiding collision between the driver's vehicle and the obstacle by generating the braking force with the braking device (20, 21, 22) without the braking operation of the driver; and automatic braking prohibition means (10, 14) for prohibiting the automatic braking control when determination is made that an accelerator operation index value is equal to or larger than an operation threshold, the accelerator operation index value having a correlation with an accelerator operation of the driver, the collision avoidance assistance apparatus being characterised by comprising: specific type determination means (10, 16) for determining whether a type of the obstacle is a specific type set in advance; and restriction means (10, 15) for restricting, when determination is made that the type of the obstacle is the specific type, an operation of the automatic braking prohibition means (10, 14) such that the automatic braking prohibition means (10, 14) does not prohibit the automatic braking control. specific type determination means (10, 16) for determining whether a type of the obstacle is a specific type set in advance; and restriction means (10, 15) for restricting, when determination is made that the type of the obstacle is the specific type, an operation of the automatic braking prohibition means (10, 14) such that the automatic braking prohibition means (10, 14) does not prohibit the automatic braking control.