Abstract: A driving assistance device of an embodiment includes a recognizer configured to recognize a surrounding situation of a mobile object, a determiner configured to determine, on the basis of the surrounding situation, whether to prompt a driver of the mobile object to perform a steering operation and whether there is a possibility of a risk occurring for the mobile object, and a notification controller configured to cause a speaker to output a guidance sound prompting the driver of the mobile object to perform a steering operation and a warning sound with respect to the risk on the basis of a result of the determination by the determiner, in which the notification controller causes output modes for the guidance sound and the warning sound to be different from each other.

Abstract: According to an embodiment, a driving assistance device includes a recognizer configured to recognize a surrounding situation of a mobile object, a decider configured to decide whether or not to prompt a driver of the mobile object to perform acceleration or deceleration on the basis of the surrounding situation, and a notification controller configured to cause a speaker to output a notification sound for prompting the driver of the mobile object to perform the acceleration or deceleration on the basis of a decision result. The notification sound is a notification sound obtained by continuously changing a structure of a sound.

Abstract: A connector driving structure includes an operating part, a driving part that moves in conjunction with movement of the operating part, a connector elastically supported by the driving part, a damper supported by the connector, and a battery stand. Operating the operating part changes the position of the driving part between a close position where the driving part is close to the battery stand and an away position where the driving part is away from the battery stand. The connector includes a connector terminal and a terminal holding portion holding the connector terminal. The damper is provided such that its first end is supported by the terminal holding portion and its second end abuts against the battery base.