To provide an operation auxiliary device for realizing smooth control.

The operation auxiliary device is provided with a peripheral situation detection means 10 of a self-vehicle A, a self-vehicle state detection means 11, an evaluation function constitution means 6a constituting an evaluation function for calculating desirability of an operation, a controlled variable operation means 6b and an actuator 12 controlling a self-vehicle unit. The evaluation function constitution means 6a is provided with a label bestowal means 6-1 requesting bestowal of a label calculating a risk degree of an object being an obstacle, a label deletion means 6-2 requesting deletion of the label and a label management means 6-3, and it constitutes the evaluation function from an item for evaluating a size of a controlled variable of the self-vehicle A, an item for evaluating a self-vehicle state, an item for evaluating the risk degrees of the respective objects and a weighting coefficient on which significance of evaluation against the respective items is reflected. The controlled variable operation means 6b is provided with a weighting coefficient change means 6-4 changing a value of the weighting coefficient of the applied object when the label management means 6-3 receives the request of bestowal or deletion of the label.