The present invention is provided with an imaging unit (10) that has an imaging head (11) to be inserted into the digestive tract (112) and images a living body by applying a laser to the digestive tract (112) via the imaging head (11); a control unit (50) for controlling the imaging head (11) to move inside the digestive tract (112); and an image processing unit (70) for processing an image captured by the imaging unit (10). The imaging unit (10) captures a plurality of imaging regions (P) to be imaged along with the movement of the imaging head (11) such that a portion of adjacent imaging regions (P1, P2) overlap, and the image processing unit (70) overlaps regions (Pa) in which the plurality of imaging regions (P1, P2) are overlapped to generate a composite image.