An X-ray inspection apparatus comprising: an X-ray emitter configured to emit an X-ray; an X-ray detector configured to detect the X-ray; and an air-guiding unit configured to guide air to at least part of the X-ray detector ; a conveyance unit configured to convey an article (G) along a conveying direction (A) from a carry-in port to a carry-out port via an inspection area (R); a controller configured to control operation of each component of the X-ray inspection apparatus ; a housing accommodating the conveyance unit , the X-ray emitter , the X-ray detector , and the controller ; wherein the X-ray inspection apparatus is configured to generate an X-ray transmission image of the article (G) while conveying the article (G), and perform inspection of the article (G) on the basis of the X-ray transmission image; inside the housing , an inspection area (R) where the article (G) is inspected with the X-ray is provided, and the carry-in port through which the article (G) is conveyed into the inspection area (R) and the carry-out port through which the article (G) is carried out from the inspection area (R) are formed; the air-guiding unit includes a cold-air blower and a flow passage ; and the cold-air blower is configured to: draw air inside the housing and outside the housing from air inlets , exchange heat of the drawn air with a heat exchanger, and supply the air cooled by the heat exchanger from a supply port into the housing ; characterized in that the air-guiding unit guides the air such that the cold air discharged from the cold-air blower flows into the flow passage facing part of the X-ray detector . an X-ray emitter configured to emit an X-ray; an X-ray detector configured to detect the X-ray; and an air-guiding unit configured to guide air to at least part of the X-ray detector ; a conveyance unit configured to convey an article (G) along a conveying direction (A) from a carry-in port to a carry-out port via an inspection area (R); a controller configured to control operation of each component of the X-ray inspection apparatus ; a housing accommodating the conveyance unit , the X-ray emitter , the X-ray detector , and the controller ; wherein the X-ray inspection apparatus is configured to generate an X-ray transmission image of the article (G) while conveying the article (G), and perform inspection of the article (G) on the basis of the X-ray transmission image; inside the housing , an inspection area (R) where the article (G) is inspected with the X-ray is provided, and the carry-in port through which the article (G) is conveyed into the inspection area (R) and the carry-out port through which the article (G) is carried out from the inspection area (R) are formed; the air-guiding unit includes a cold-air blower and a flow passage ; and the cold-air blower is configured to: draw air inside the housing and outside the housing from air inlets , exchange heat of the drawn air with a heat exchanger, and supply the air cooled by the heat exchanger from a supply port into the housing ; draw air inside the housing and outside the housing from air inlets , exchange heat of the drawn air with a heat exchanger, and supply the air cooled by the heat exchanger from a supply port into the housing ; characterized in that the air-guiding unit guides the air such that the cold air discharged from the cold-air blower flows into the flow passage facing part of the X-ray detector . <EOS>