A wrist blood pressure apparatus includes a host and a wrist strip. The bottom surface of the host is combined with the wrist strip. The host includes a display screen capable of showing measured blood pressure values and a measurement assistance device. The display screen is disposed on the top surface of the host. The measurement assistance device includes at least one observation aperture and a alignment assistance element. The at least one observation aperture has an opening. A predetermined distance between the opening and the alignment assistance element is defined. The predetermined distance is not less than the size of the opening.一種腕式血壓計包含一主機及一腕帶,主機的底面是與腕帶相互結合。主機包括一能顯示血壓值的顯示幕及一測量輔助器,顯示幕是設於主機的頂面。測量輔助器包括至少一觀察孔及一設於接近底面的對準輔助元件,觀察孔具有至少一開口,其中觀察孔的開口至對準輔助元件定義有一預定距離,預定距離是大於開口的尺寸。10‧‧‧腕式血壓計11‧‧‧主機12‧‧‧腕帶13‧‧‧測量輔助器111‧‧‧顯示幕112‧‧‧按鍵113‧‧‧頂面114‧‧‧底面131‧‧‧觀察孔132‧‧‧對準輔助面
