a sample injecting device is provided for reducing carryover . the sample injecting device includes the following mode : a needle is set at a low descending speed when sample is injected into an injection port in a total - volume injection manner by the sample injecting device . when the needle is in contact with the injection port , the needle is set at a low speed , thereby increasing the accuracy of the position of the needle relative to an injection hole and decreasing friction between the needle and the injection hole . contaminants present in the injection hole are prevented from easily flowing from the injection hole into an analyzing flow path , so as to achieve an excellent low carryover .