An image processing device comprising: a first image acquisition section that acquires a first image, the first image being a color image that includes a plurality of channels, and includes an object image including information within a wavelength band of white light; a second image acquisition section that acquires a second image, the second image being an image that includes an object image including information within a specific wavelength band, and differs from the plurality of channels included in the first image; a candidate attention area detection section that detects a candidate attention area based on a feature quantity of each pixel within the second image, the candidate attention area being a candidate for an attention area; a reliability calculation section that calculates reliability that indicates a likelihood that the candidate attention area detected by the candidate attention area detection section is the attention area; and a display mode setting section that performs a display mode setting process that sets a display mode of an output image corresponding to the reliability calculated by the reliability calculation section, characterized in that the display mode setting section includes a processing section that performs a processing process on the first image based on the reliability calculated by the reliability calculation section and the first image, the display mode setting section sets an area within the first image that corresponds to the candidate attention area to be a corresponding attention area, and performs the processing process on the corresponding attention area, and the processing section performs a blending process on the first image and the second image as the processing process to set the display mode of the output image. a first image acquisition section that acquires a first image, the first image being a color image that includes a plurality of channels, and includes an object image including information within a wavelength band of white light; a second image acquisition section that acquires a second image, the second image being an image that includes an object image including information within a specific wavelength band, and differs from the plurality of channels included in the first image; a candidate attention area detection section that detects a candidate attention area based on a feature quantity of each pixel within the second image, the candidate attention area being a candidate for an attention area; a reliability calculation section that calculates reliability that indicates a likelihood that the candidate attention area detected by the candidate attention area detection section is the attention area; and a display mode setting section that performs a display mode setting process that sets a display mode of an output image corresponding to the reliability calculated by the reliability calculation section, the display mode setting section includes a processing section that performs a processing process on the first image based on the reliability calculated by the reliability calculation section and the first image, the display mode setting section sets an area within the first image that corresponds to the candidate attention area to be a corresponding attention area, and performs the processing process on the corresponding attention area, and the processing section performs a blending process on the first image and the second image as the processing process to set the display mode of the output image.