Lateral sounding smoke alarm

The invention relates to the technical field of smoke alarms, and particularly discloses a lateral sounding smoke alarm which comprises an alarm main body and supporting mechanisms, the alarm main body comprises a circuit board and a monitoring box of the smoke alarm, the alarm main body further comprises a base used for installation, and the supporting mechanisms are located on the two sides of the alarm main body. An upper shell is fixedly connected to the lower portion of the base, and a bearing assembly is arranged below the upper shell. According to the smoke alarm, the two circuit boards and the monitoring box are additionally arranged, so that the smoke monitoring area is increased on the premise that the monitoring threshold value of the smoke alarm is not changed and false alarm is avoided, the sensitivity of the smoke alarm is improved, and the alarm main body and the supporting mechanism are matched with each other, so that the smoke alarm is more reliable. The shell of the smoke alarm with the cir