A micro-bolometer type infrared (IR) sensing device is provided. The IR sensing device includes an absorbed heat discharging part and a sensing structure part formed as bean structure, spaced apart from the absorbed heat discharging part, supported at least at one end on the absorbed heat discharging part, and discharging heat absorbed in the sensing structure part by being elastically deformed and thus touching the absorbed heat discharging part. The sensing structure part includes a sensing part with variation in secondary attribute according to heat and a light-absorbing part formed into one unit with the sensing part in a manner to surround the sensing part as seen in section view, and converting energy of incident photons into heat. The sensing structure part discharges heat absorbed therein by being elastically deformed and thus touching the absorbed heat discharge part spaced apart downward from the sensing structure part.