First sounding mechanism, which issues sound when spool rotates relative to spool shaft, is furnished with sound-emitting member, pawl member, and plate spring. A propagation time of the delay element is selected with the non-volatile fuses. The employed starting materials are cheap and can be easily removed andor washed away. The common reset signal line and the common light emitting signal line are substantially disposed inside the first pixel and the second pixel respectively and are electrically connected to the first pixel and the second pixel. The sphygmomanometer includes an air system piping communicating to the cuff in the blood pressure measurement mode and communicating to an air system of the accuracy check device in the accuracy check mode, a pressurization and depressurization unit for adjusting pressure to be applied to the air system piping, and a first pressure detection unit for detecting pressure in the air system piping.