A hydrogen ion sensing device of the present invention includes: a reference electrode; a sensing portion which senses hydrogen ions by contacting an ion aqueous solution; and a plurality of ring-like lateral bipolar junction transistors, each including a lateral collector, an emitter, a vertical collector and a floating gate connected to the reference electrode, with the emitter surrounded by the floating gate and the lateral collector, wherein the plurality of ring-like lateral bipolar junction transistors are formed on a common substrate and are connected in parallel.