A sample analyzer for analyzing a sample using a reagent in a reagent container comprising: a first reagent container holding unit configured to hold a first reagent container attached with a first electronic tag recorded with reagent information regarding a reagent; a second reagent container holding unit configured to hold a second reagent container attached with a second electronic tag recorded with reagent information regarding a reagent, and being arranged on an inner peripheral side of the first reagent container holding unit; an antenna, arranged on an outer peripheral side of the first reagent container holding unit and being configured to receive respective electric waves from the first electronic tag of the first reagent container and from the second electronic tag of the second reagent container , and a reagent information acquiring unit configured to acquire the reagent information recorded in the first electronic tag based on the electric wave received by the antenna from the first electronic tag , and to acquire the reagent information recorded in the second electronic tag based on the electric wave received by the antenna from the second electronic tag , wherein the first reagent container holding unit holds a plurality of first reagent containers in a lined state; and the sample analyzer further comprises: a drive unit configured to move the first reagent container holding unit ; and a control unit configured to control the drive unit to position a gap (F) between adjacent first reagent containers of the first reagent container holding unit in a region through which the second electronic tag and the antenna face each other, when the antenna receives the electric wave from the second electronic tag of the second reagent container . a first reagent container holding unit configured to hold a first reagent container attached with a first electronic tag recorded with reagent information regarding a reagent; a second reagent container holding unit configured to hold a second reagent container attached with a second electronic tag recorded with reagent information regarding a reagent, and being arranged on an inner peripheral side of the first reagent container holding unit; an antenna, arranged on an outer peripheral side of the first reagent container holding unit and being configured to receive respective electric waves from the first electronic tag of the first reagent container and from the second electronic tag of the second reagent container , and a reagent information acquiring unit configured to acquire the reagent information recorded in the first electronic tag based on the electric wave received by the antenna from the first electronic tag , and to acquire the reagent information recorded in the second electronic tag based on the electric wave received by the antenna from the second electronic tag , wherein a drive unit configured to move the first reagent container holding unit ; and a control unit configured to control the drive unit to position a gap (F) between adjacent first reagent containers of the first reagent container holding unit in a region through which the second electronic tag and the antenna face each other, when the antenna receives the electric wave from the second electronic tag of the second reagent container . <EOS>