To provide an inexpensive autoanalyzer not requiring a manufacturing apparatus or method of high precision and easy to manufacture.

The autoanalyzer is constituted so that a liquid containing a sample or a reagent is stirred or mixed in a contactless state using a sonic wave to be reacted and the reaction liquid is analyzed and equipped with a plurality of reaction containers 7 having sonic wave transmitting walls 7b and holding the liquid and the surface elastic wave element 21 arranged in contact with the wall outer surfaces of the respective reaction containers and irradiating the liquid with the sonic wave through the walls 7b. The wall thickness (t) of each of a plurality of the reaction containers 7 along a sonic wave propagation route is the wavelength or above of the sonic wave transmitted through the wall and the irregularity of the wall thickness of each of all of the reaction containers to be used is half or above the wavelength of the sonic wave transmitted through the wall.