PROBLEM TO BE SOLVED: To provide a small medical electronic device, facilitating removal of a battery in replacing the battery and preventing the battery from jumping out carelessly to simplify replacement of the battery.SOLUTION: A sphygmomanometer 1 as a small medical electronic device taking a removably mounted battery as a driving source includes: a battery storing portion 90 having a first battery storing recessed part 94 for storing a plurality of batteries 93 electrically in series and a second battery storing recessed part 95 for storing a plurality of batteries 93 electrically in series； and a lid body 91 for opening and closing the battery storing portion 90, wherein the first battery storing recessed part 94 and the second battery storing recessed part 95 are formed in parallel, and the plurality of batteries 93 in the first battery storing recessed part 94 and the plurality of batteries 93 in the second battery storing recessed part 95 are connected to each other electrically in series, and the bottom parts of the first battery storing recessed part 94 and the second battery storing recessed part 95 are provided with inclined parts 97 located corresponding to the negative electrodes of the batteries 93.【課題】電池交換時に電池の取り出しが容易であり、電池が不用意に飛び出してしまうことを防いで電池交換が簡単に行える小型の医療用電子機器を提供する。【解決手段】着脱可能に装着される電池を駆動電源とする小型の医療用電子機器としての血圧計１は、複数の電池９３を電気的に直列に収容するための第１電池収納用凹部９４と複数の電池９３を電気的に直列に収容するための第２電池収納用凹部９５を有する電池収納部９０と、電池収納部９０を開閉する蓋体９１とを備え、第１電池収納用凹部９４と第２電池収納用凹部９５は並列に形成され、第１電池収納用凹部９４内の複数の電池９３と第２電池収納用凹部９５内の複数の電池９３は電気的に直列に接続され、第１電池収納用凹部９４と第２電池収納用凹部９５の底部には、電池９３の負極に対応する位置に傾斜部９７が設けられている。【選択図】図７
