PROBLEM TO BE SOLVED: To enable the confirmation of vehicle window closure forgetting at arbitrary timing.SOLUTION: A vehicle window closure forgetting prevention device 100 includes a sound generation unit 101 for generating a confirmation sound signal for confirming vehicle window closure forgetting, a sound collection unit 103 for collecting sound outputted from a sound output unit 102 on the basis of the confirmation sound signal, a sound feature analysis unit 104 for analyzing a feature of a sound signal collected by the sound collection unit 103, a control unit 105 for controlling a notification unit 106 for providing a notification of vehicle window closure forgetting on the basis of the feature analyzed by the sound feature analysis unit 104, and a transmission unit 107 for transmitting information indicating the vehicle window closure forgetting to an external apparatus 110 preliminarily registered as the notification unit 106. The external apparatus 110 displays information received by a reception unit 111 on a display unit 112 when the reception unit 111 receives the information transmitted from the transmission unit 107.SELECTED DRAWING: Figure 1
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