An imaging device comprising: an imaging unit (2, 3) configured to output an image signal by performing video image capture; and a video image information generation unit configured to sequentially acquire frames from the image signal, cut out partial image information of a cutout range from the respective acquired frames, and thereby generate video image information, characterized in that the imaging device further comprises: an imaging time information storage unit configured to store imaging time information for which an imaging time duration is measured for each imaging direction under which the imaging unit performs a video image capture during a predetermined period preceding a predetermined determination timing, and the video image information generation unit is configured to specify, at said predetermined determination timing, the imaging direction with the longest imaging time duration, from among the imaging time information stored in the imaging time information storage unit, determine whether the partial image information of a first cutout range in a frame captured under the specified imaging direction is included in a frame captured under a current imaging direction, and when it is determined as being included, change the range to be cut out from a frame to be acquired subsequently, to a second cutout range corresponding to the partial image information of the first cutout range, thereby generating the video image information with a stable angle of view. an imaging unit (2, 3) configured to output an image signal by performing video image capture; and a video image information generation unit configured to sequentially acquire frames from the image signal, cut out partial image information of a cutout range from the respective acquired frames, and thereby generate video image information, characterized in that the imaging device further comprises: an imaging time information storage unit configured to store imaging time information for which an imaging time duration is measured for each imaging direction under which the imaging unit performs a video image capture during a predetermined period preceding a predetermined determination timing, and the video image information generation unit is configured to specify, at said predetermined determination timing, the imaging direction with the longest imaging time duration, from among the imaging time information stored in the imaging time information storage unit, determine whether the partial image information of a first cutout range in a frame captured under the specified imaging direction is included in a frame captured under a current imaging direction, and when it is determined as being included, change the range to be cut out from a frame to be acquired subsequently, to a second cutout range corresponding to the partial image information of the first cutout range, thereby generating the video image information with a stable angle of view. an imaging time information storage unit configured to store imaging time information for which an imaging time duration is measured for each imaging direction under which the imaging unit performs a video image capture during a predetermined period preceding a predetermined determination timing, and the video image information generation unit is configured to specify, at said predetermined determination timing, the imaging direction with the longest imaging time duration, from among the imaging time information stored in the imaging time information storage unit, determine whether the partial image information of a first cutout range in a frame captured under the specified imaging direction is included in a frame captured under a current imaging direction, and when it is determined as being included, change the range to be cut out from a frame to be acquired subsequently, to a second cutout range corresponding to the partial image information of the first cutout range, thereby generating the video image information with a stable angle of view.