A liquid property measurement device comprising: a glass electrode that comprises: a flat sensitive glass body sensitive to ions; a base body formed of a glass tube housing an internal solution; and a fixation layer (2c2) used to sealingly attach the sensitive glass body to an end surface of the base body, wherein the glass electrode is configured to measure a cation concentration of a test solution, an electrical resistance value of the fixation layer is equal to or higher than an electrical resistance value of the sensitive glass body, the flat sensitive glass body is sealingly attached to the end surface of the base body via the fixation layer to be a surface parallel to the end surface, and the fixation layer has an annular shape corresponding to the shape of the end surface of the base body, and the liquid property measurement device further comprises: a calculation unit configured to correct the cation concentration of the test solution obtained based on a potential of the glass electrode by using a correction value based on electrical resistance values of the sensitive glass body and the fixation layer and output the corrected cation concentration as a measurement value, wherein the fixation layer (2c2) is formed by sintering a glass paste (2c1), which is a low-temperature type glass paste, and the fixation layer (2c2) is disposed between an end surface (2b1) of the base body and the upper surface (2a1) of the flat sensitive glass body. a glass electrode that comprises: a flat sensitive glass body sensitive to ions; a base body formed of a glass tube housing an internal solution; and a fixation layer (2c2) used to sealingly attach the sensitive glass body to an end surface of the base body, wherein a flat sensitive glass body sensitive to ions; a base body formed of a glass tube housing an internal solution; and a fixation layer (2c2) used to sealingly attach the sensitive glass body to an end surface of the base body, wherein the glass electrode is configured to measure a cation concentration of a test solution, an electrical resistance value of the fixation layer is equal to or higher than an electrical resistance value of the sensitive glass body, the flat sensitive glass body is sealingly attached to the end surface of the base body via the fixation layer to be a surface parallel to the end surface, and the fixation layer has an annular shape corresponding to the shape of the end surface of the base body, and the liquid property measurement device further comprises: a calculation unit configured to correct the cation concentration of the test solution obtained based on a potential of the glass electrode by using a correction value based on electrical resistance values of the sensitive glass body and the fixation layer and output the corrected cation concentration as a measurement value, wherein the fixation layer (2c2) is formed by sintering a glass paste (2c1), which is a low-temperature type glass paste, and the fixation layer (2c2) is disposed between an end surface (2b1) of the base body and the upper surface (2a1) of the flat sensitive glass body. a calculation unit configured to correct the cation concentration of the test solution obtained based on a potential of the glass electrode by using a correction value based on electrical resistance values of the sensitive glass body and the fixation layer and output the corrected cation concentration as a measurement value, wherein the fixation layer (2c2) is formed by sintering a glass paste (2c1), which is a low-temperature type glass paste, and the fixation layer (2c2) is disposed between an end surface (2b1) of the base body and the upper surface (2a1) of the flat sensitive glass body.