To provide a belt which can prevent an increase in the number of electrodes and an electrocardiography measurement device.SOLUTION: A belt 20 includes: a belt body 21 which is wound around an upper arm 5 in a circumferential direction of the upper arm 5； and an electrode array 30 which has a plurality of electrodes 31, fixed on an inner surface 24 of the belt body 21 side by side in a longitudinal direction X of the belt body 21, of the number more than N+2 when N represents the number of electrodes required to obtain electrocardiographic information, and in which the electrodes 31, including a first electrode 31A located on one end in the direction X, from the first electrode 31A to the (N+1)-th electrode in the direction X, are equally spaced at a prescribed interval, and the (N+1)-th and succeeding electrodes 31 are arranged at an interval greater than the aforementioned interval.SELECTED DRAWING: Figure 3【課題】電極数が多くなることを防止可能なベルト、心電測定装置を提供すること。【解決手段】ベルト２０は、上腕５に、当該上腕５の周方向に巻き付けられるベルト本体２１と、ベルト本体２１の内面２４にベルト本体２１の長手方向となる方向Ｘに並んで固定された、心電の情報を得る為に必要な電極数をＮとしたときＮ＋２より大きい複数の電極３１を具備し、方向Ｘの一端に位置する第１の電極３１Ａを含んで第１の電極３１Ａから方向ＸにＮ＋１番目までの電極３１が所定の間隔で等間隔に並び、Ｎ＋１番目以降の電極３１の間隔は、上述した所定の間隔より大きい電極アレイ３０とを有する。【選択図】 図３
