1. cuff (20) measuring devices for estimating blood pressure, comprising: a chamber (34) of the fluid for applying pressure to the body, the outer cover (30) having a first major surface (31) and a second major surface (32), which accommodates chamber (34) of the fluid towards one end portion (30a) a first fastening element (41) provided in a direction towards said one end portion (30a) on the first major surface (31) and a second fastening element (42) provided towards the other end portion (30b) on the first major surface (31) or towards the other end portion (30b) on the second major surface (32), wherein the outer cover (30) wrapped around the body in a ring shape, wherein the first fastening element (41) and a second fastening element (42) is held wrapped by the outer cover (30) on the body in the secured state wherein the outer cover (30) includes, in the area of the outer cover (30 ), which includes a zone (R2), wherein the second fastening is provided element (42), a first wide portion (33A), in which the width of the outer cover (30) is greater than the width (L1) area the external cover (30) which includes a zone (R1), wherein the first fastening member is provided ( 41) and a second fixing member (42) includes a second portion (43A), on which the width of the second fastening element (42) is greater than the width (W1) of the first fastening element (41) .2. The cuff device for measuring the blood pressure estimation according to claim 1, wherein the first wide portion (33A) on the outer cover (30) and a second portion (43A) on the second fastening element (42) have an approximately arcuate shape, the widths of which gradually withdrawn1. Манжета (20) устройства измерения для оценки кровяного давления, содержащая:камеру (34) текучей среды для приложения давления к телувнешний чехол (30), имеющий первую основную поверхность (31) и вторую основную поверхность (32), который вмещает камеру (34) текучей среды в направлении к одному концевому участку (30a)пер