A blood cell analyzer, comprising: a sample aspirating section which comprises an aspiration tube for aspirating a blood sample, and which aspirates a blood sample from a sample container by using the aspiration tube; a sample preparing section configured to prepare a measurement sample from the blood sample aspirated by the sample aspirating section and a reagent; a measuring section configured to measure the measurement sample prepared by the sample preparing section; and an information processing section configured to: control the sample aspirating section so as to perform a first sample supplying operation when the information processing section has received an instruction to only measure one or more measurement items included in one group with respect to the blood sample, wherein the first sample supplying operation includes aspirating the blood sample by a first amount and supplying the aspirated blood sample to the sample preparing section; and characterized in that the information processing section is further configured to: control the sample aspirating section so as to perform a second sample supplying operation and a third sample supplying operation when the information processing section has received an instruction to measure one or more measurement items included in the one group and another measurement item not included in the one group with respect to the blood sample, wherein the second sample supplying operation includes aspirating the blood sample by the first amount for the measurement items included in the one group and supplying the aspirated blood sample to the sample preparing section, and the third sample supplying operation includes aspirating the blood sample by a second amount for the another measurement item and supplying the aspirated blood sample to the sample preparing section. a sample aspirating section which comprises an aspiration tube for aspirating a blood sample, and which aspirates a blood sample from a sample container by using the aspiration tube; a sample preparing section configured to prepare a measurement sample from the blood sample aspirated by the sample aspirating section and a reagent; a measuring section configured to measure the measurement sample prepared by the sample preparing section; and an information processing section configured to: control the sample aspirating section so as to perform a first sample supplying operation when the information processing section has received an instruction to only measure one or more measurement items included in one group with respect to the blood sample, wherein the first sample supplying operation includes aspirating the blood sample by a first amount and supplying the aspirated blood sample to the sample preparing section; and characterized in that the information processing section is further configured to: control the sample aspirating section so as to perform a second sample supplying operation and a third sample supplying operation when the information processing section has received an instruction to measure one or more measurement items included in the one group and another measurement item not included in the one group with respect to the blood sample, wherein the second sample supplying operation includes aspirating the blood sample by the first amount for the measurement items included in the one group and supplying the aspirated blood sample to the sample preparing section, and the third sample supplying operation includes aspirating the blood sample by a second amount for the another measurement item and supplying the aspirated blood sample to the sample preparing section. control the sample aspirating section so as to perform a first sample supplying operation when the information processing section has received an instruction to only measure one or more measurement items included in one group with respect to the blood sample, wherein the first sample supplying operation includes aspirating the blood sample by a first amount and supplying the aspirated blood sample to the sample preparing section; and characterized in that the information processing section is further configured to: control the sample aspirating section so as to perform a second sample supplying operation and a third sample supplying operation when the information processing section has received an instruction to measure one or more measurement items included in the one group and another measurement item not included in the one group with respect to the blood sample, wherein the second sample supplying operation includes aspirating the blood sample by the first amount for the measurement items included in the one group and supplying the aspirated blood sample to the sample preparing section, and the third sample supplying operation includes aspirating the blood sample by a second amount for the another measurement item and supplying the aspirated blood sample to the sample preparing section.