To provide a highly convenient pen type device capable of achieving a small size/light weight of the whole device, and securing a sufficient operation time in actual use.SOLUTION: A pen type device includes a pen type housing, a circuit part 41 stored in the housing, and a sheet-like air battery 10 used as an operation power source for a drive circuit section, in which the air battery is curved cylindrically by using an axis 70 of the housing as a central axis with the positive electrode 1 side as the outside.SELECTED DRAWING: Figure 1【課題】 装置全体の小型軽量化を実現するとともに実使用上十分な動作時間が確保された、利便性の高いペン型装置を得ること。【解決手段】 ペン型の筐体と、筐体内に収容された回路部４１と、駆動回路部の動作電源となるシート状の空気電池１０とを備え、空気電池は、正極１側が外側となる状態で筐体の軸７０を中心軸とする略筒状となるように湾曲している。【選択図】図１
