The present invention is to present a sample analyzer which can conduct a stable feeding of container used for preparing a measuring sample. The sample analyzer comprises: a first storage section for storing a plurality of containers, the container used for preparing a measurement sample; a first transport section for transporting the containers stored in the first storage section; a second storage section for storing the containers transported by the first transport section; a second transport section for transporting one by one the containers stored in the second storage section; a detector for detecting a state of transporting containers by the second transport section; a controller for controlling an operation of the first transport section based on a detection result of the detector; a sample preparing section for preparing a measurement sample in the container transported by the second transport section; and an analyzing section for analyzing the measurement sample prepared by the sample preparing section.