An analyzer, comprising: a plurality of stirrers (20, 26, 27, 28) that have a plurality of sound-wave generating units, which are provided on respective vessels holding liquid and which generate sound wave toward the liquid, each respective vessel is arranged on a reaction table, and drive units, which include power sources and drive the plurality of sound-wave generating units, that stir the liquid using sound wave generated by the sound-wave generating units, and that have power detecting units that detect traveling-wave power output from the power sources of the drive units and reflected-wave power reflected from the sound-wave generating units; a temperature detecting unit that detects a temperature of the liquid; and a control unit that determines whether an abnormality occurs in each of the stirrers (20, 26, 27, 28) on the sound-wave generating unit side or on the drive unit side based on a change in temperature of the liquid before and after being stirred and a ratio between the traveling-wave power and the reflected-wave power, and controls continuation or suspension of an analytical work based on a result of the determination. a plurality of stirrers (20, 26, 27, 28) that have a plurality of sound-wave generating units, which are provided on respective vessels holding liquid and which generate sound wave toward the liquid, each respective vessel is arranged on a reaction table, and drive units, which include power sources and drive the plurality of sound-wave generating units, that stir the liquid using sound wave generated by the sound-wave generating units, and that have power detecting units that detect traveling-wave power output from the power sources of the drive units and reflected-wave power reflected from the sound-wave generating units; that have a plurality of sound-wave generating units, which are provided on respective vessels holding liquid and which generate sound wave toward the liquid, each respective vessel is arranged on a reaction table, and drive units, which include power sources and drive the plurality of sound-wave generating units, a plurality of sound-wave generating units, which are provided on respective vessels holding liquid and which generate sound wave toward the liquid, each respective vessel is arranged on a reaction table, and drive units, which include power sources and drive the plurality of sound-wave generating units, that stir the liquid using sound wave generated by the sound-wave generating units, and that have power detecting units that detect traveling-wave power output from the power sources of the drive units and reflected-wave power reflected from the sound-wave generating units; a temperature detecting unit that detects a temperature of the liquid; and a control unit that determines whether an abnormality occurs in each of the stirrers (20, 26, 27, 28) on the sound-wave generating unit side or on the drive unit side based on a change in temperature of the liquid before and after being stirred and a ratio between the traveling-wave power and the reflected-wave power, and controls continuation or suspension of an analytical work based on a result of the determination. determines whether an abnormality occurs in each of the stirrers (20, 26, 27, 28) on the sound-wave generating unit side or on the drive unit side based on a change in temperature of the liquid before and after being stirred and a ratio between the traveling-wave power and the reflected-wave power, and controls continuation or suspension of an analytical work based on a result of the determination.