A glycated hemoglobin analyzer using a liquid chromatography, comprising: a sampling part (17, 18, 37, 38) for automatic dilution of a blood sample to create a diluted sample for analysis, a sample injection valve for supplying said diluted sample to be analyzed to a separation column; a liquid supplying pump (11, 40) for supplying an eluent; a separation column for separating a hemoglobin component; and a detector for detecting the separated component; characterized in that: said sampling part (17, 18, 37, 38) comprises a flow passage change-over mechanism comprising a flow passage change-over valve of the rotary type (17, 38), and a syringe pump (18, 37), wherein said flow passage change-over valve is a non-electromagnetic valve type, said flow passage change-over mechanism is constructed such that a flow passage is formed by a changeover of said flow passage change-over valve, said flow passage change-over valve (17, 38) has at least three ports (1, 2, 3, 4, 5, 6, 7), and said flow passage change-over valve (17, 38) is changed over to connect two ports (1, 2, 3, 4, 5, 6, 7) to thereby form the flow passage, said syringe pump (18, 37) is connected to the center port of said flow passage change-over valve (17, 38), a wash and hemolysis solution part is connected to an other one port (1, 2, 3, 4, 5, 6) of said valve (17, 38) for sucking the wash and hemolysis solution into said syringe pump (18, 37), and said sample injection valve is connected to an other one port ((1, 2, 3, 4, 5, 6) of said valve (17, 38) (i) for discharging said blood sample sucked in a sampling needle to a dilution block for mixing and dilution, (ii) for introducing a diluted sample to the sample injection valve and (iii) for cleaning the inside of the sampling needle. a sampling part (17, 18, 37, 38) for automatic dilution of a blood sample to create a diluted sample for analysis, a sample injection valve for supplying said diluted sample to be analyzed to a separation column; a liquid supplying pump (11, 40) for supplying an eluent; a separation column for separating a hemoglobin component; and a detector for detecting the separated component; said sampling part (17, 18, 37, 38) comprises a flow passage change-over mechanism comprising a flow passage change-over valve of the rotary type (17, 38), and a syringe pump (18, 37), wherein said flow passage change-over valve is a non-electromagnetic valve type, said flow passage change-over mechanism is constructed such that a flow passage is formed by a changeover of said flow passage change-over valve, said flow passage change-over valve (17, 38) has at least three ports (1, 2, 3, 4, 5, 6, 7), and said flow passage change-over valve (17, 38) is changed over to connect two ports (1, 2, 3, 4, 5, 6, 7) to thereby form the flow passage, said syringe pump (18, 37) is connected to the center port of said flow passage change-over valve (17, 38), a wash and hemolysis solution part is connected to an other one port (1, 2, 3, 4, 5, 6) of said valve (17, 38) for sucking the wash and hemolysis solution into said syringe pump (18, 37), and said sample injection valve is connected to an other one port ((1, 2, 3, 4, 5, 6) of said valve (17, 38) (i) for discharging said blood sample sucked in a sampling needle to a dilution block for mixing and dilution, (ii) for introducing a diluted sample to the sample injection valve and (iii) for cleaning the inside of the sampling needle. (i) for discharging said blood sample sucked in a sampling needle to a dilution block for mixing and dilution, (ii) for introducing a diluted sample to the sample injection valve and (iii) for cleaning the inside of the sampling needle.