An obstacle alarm device, comprising: a captured image acquisition unit acquiring a captured image in which an image of a visual scene of a periphery of a vehicle has been captured; an attention-prioritized captured image generation unit generating an attention-prioritized captured image (N; B) on the basis of the captured image, wherein the attention-prioritized captured image (N; B) corresponds to a display image displayed on a monitor; an object presence determination unit determining whether or not an object is present in a periphery of the vehicle; and a movement direction determination unit determining a movement direction of the object, characterized in that the object presence determination unit determines whether or not the object is present in an outside region of the exterior of the attention-prioritized captured image (N; B), the obstacle alarm device further comprises a clear indication image output unit causing a frame sign, which has a smaller outer shape than an outline of the attention-prioritized captured image ( N; B) and is turned on for a fixed duration of time and thereafter turned off, to be displayed at sequentially varying positions from an outer edge part of the attention-prioritized captured image (N; B) toward a center thereof so as to gradually become smaller, and providing an alarm by repeatedly performing such displaying, in a case where the object presence determination unit has determined that the object is present in an outside region of the exterior of the attention-prioritized captured image (N; B) and the movement direction determination unit has determined that the object is moving toward the center of the attention-prioritized captured image (N; B), and the attention-prioritized captured image generation unit generates a center portion of the captured image as the attention-prioritized captured image (N; B). a captured image acquisition unit acquiring a captured image in which an image of a visual scene of a periphery of a vehicle has been captured; an attention-prioritized captured image generation unit generating an attention-prioritized captured image (N; B) on the basis of the captured image, wherein the attention-prioritized captured image (N; B) corresponds to a display image displayed on a monitor; an object presence determination unit determining whether or not an object is present in a periphery of the vehicle; and a movement direction determination unit determining a movement direction of the object, characterized in that the object presence determination unit determines whether or not the object is present in an outside region of the exterior of the attention-prioritized captured image (N; B), the obstacle alarm device further comprises a clear indication image output unit causing a frame sign, which has a smaller outer shape than an outline of the attention-prioritized captured image ( N; B) and is turned on for a fixed duration of time and thereafter turned off, to be displayed at sequentially varying positions from an outer edge part of the attention-prioritized captured image (N; B) toward a center thereof so as to gradually become smaller, and providing an alarm by repeatedly performing such displaying, in a case where the object presence determination unit has determined that the object is present in an outside region of the exterior of the attention-prioritized captured image (N; B) and the movement direction determination unit has determined that the object is moving toward the center of the attention-prioritized captured image (N; B), and the attention-prioritized captured image generation unit generates a center portion of the captured image as the attention-prioritized captured image (N; B).