The present invention discloses a tunnel type electronic sphygmomanometer which comprises a base; an electronic manometer casing disposed on the base; a display device installed on the electronic manometer casing; and a blood pressure measuring device installed on one side of the electronic manometer casing; wherein the blood pressure measuring device is coupled to the electronic manometer casing through an electric circuit and a gas pipeline, such that the blood pressure measuring device is coupled by a fixture during the manufacturing process of the electronic sphygmomanometers, and sphygmomanometer manufacturers can meet the requirements for a blood pressure measurement taken from the left arm or the right arm of a user, wherein the electronic sphygmomanometer can be placed on either sides of the arm of the user as to achieve the objectives of effectively lowering the manufacturing cost and reducing the storage space for inventory.