A method of measuring an analyte and hemoglobin in a sample by immunochromatography including the following steps A to D, wherein the sample is a blood hemolyzed and diluted by a factor of 50 to 400: A. a step of measuring hemoglobin in the sample by competitive immunochromatography using 1) and 2) described below, 1) a conjugate in which a first antibody against hemoglobin is immobilized to a label, and 2) an insoluble membrane support to which a second antibody against hemoglobin is immobilized, wherein if an epitope of the first antibody against hemoglobin is monovalent, an epitope of the second antibody is different from the first antibody, while if an epitope of the first antibody is multivalent, an epitope of the second antibody may be the same as the first antibody or the first antibody may be the same as the second antibody; B. a step of measuring the analyte in the sample by immunochromatography using 5) and 6) described below, 5) a conjugate in which a first antibody against the analyte is immobilized to a label, and 6) an insoluble membrane support to which a second antibody against the analyte is immobilized, wherein if an epitope of the first antibody against the analyte is monovalent, an epitope of the second antibody is different from the first antibody, while if an epitope of the first antibody is multivalent, an epitope of the second antibody may be the same as the first antibody or the first antibody may be the same as the second antibody; C. a step of obtaining a hematocrit value of the sample from a measurement value of hemoglobin acquired at the step A; and D. a step of correcting a measurement value of the analyte acquired at the step B by using the hematocrit value acquired at the step C, wherein the steps A and B are steps using the same insoluble membrane support, and wherein the steps A and B are performed in the same flow passage. A. a step of measuring hemoglobin in the sample by competitive immunochromatography using 1) and 2) described below, 1) a conjugate in which a first antibody against hemoglobin is immobilized to a label, and 2) an insoluble membrane support to which a second antibody against hemoglobin is immobilized, wherein if an epitope of the first antibody against hemoglobin is monovalent, an epitope of the second antibody is different from the first antibody, while if an epitope of the first antibody is multivalent, an epitope of the second antibody may be the same as the first antibody or the first antibody may be the same as the second antibody; 1) a conjugate in which a first antibody against hemoglobin is immobilized to a label, and 2) an insoluble membrane support to which a second antibody against hemoglobin is immobilized, B. a step of measuring the analyte in the sample by immunochromatography using 5) and 6) described below, 5) a conjugate in which a first antibody against the analyte is immobilized to a label, and 6) an insoluble membrane support to which a second antibody against the analyte is immobilized, wherein if an epitope of the first antibody against the analyte is monovalent, an epitope of the second antibody is different from the first antibody, while if an epitope of the first antibody is multivalent, an epitope of the second antibody may be the same as the first antibody or the first antibody may be the same as the second antibody; 5) a conjugate in which a first antibody against the analyte is immobilized to a label, and 6) an insoluble membrane support to which a second antibody against the analyte is immobilized, wherein if an epitope of the first antibody against the analyte is monovalent, an epitope of the second antibody is different from the first antibody, while if an epitope of the first antibody is multivalent, an epitope of the second antibody may be the same as the first antibody or the first antibody may be the same as the second antibody; C. a step of obtaining a hematocrit value of the sample from a measurement value of hemoglobin acquired at the step A; and D. a step of correcting a measurement value of the analyte acquired at the step B by using the hematocrit value acquired at the step C,