A liquid chromatograph comprising: a mobile phase supply device that supplies a mobile phase to be used in liquid chromatograph analysis of a sample; an injector to which a mobile phase produced by the mobile phase supply device and a sample are supplied; a column into which the mobile phase and the sample that have been supplied to the injector are introduced; a detector that detects the sample that has passed through the column; and a column oven that stores the column and adjusts a temperature of the column, wherein the mobile phase supply device includes: a first storage that stores an aqueous solution including salt; a second storage that stores an organic solvent; a mixer that produces the mobile phase by mixing the aqueous solution stored in the first storage with the organic solvent stored in the second storage; a first pipe that connects the mixer to the first storage; a second pipe that connects the mixer to the second storage; and a heater that heats at least a portion of the first pipe and at least a portion of the second pipe, wherein the heater is configured to adjust a temperature of the mobile phase produced by the mixer to a temperature that is equal to or higher than a dissolution temperature of salt included in the aqueous solution, and wherein the column oven includes the heater and heats at least the portion of the first pipe and at least the portion of the second pipe while further storing at least the portion of the first pipe and at least the portion of the second pipe. a mobile phase supply device that supplies a mobile phase to be used in liquid chromatograph analysis of a sample; an injector to which a mobile phase produced by the mobile phase supply device and a sample are supplied; a column into which the mobile phase and the sample that have been supplied to the injector are introduced; a detector that detects the sample that has passed through the column; and a column oven that stores the column and adjusts a temperature of the column, wherein the mobile phase supply device includes: a first storage that stores an aqueous solution including salt; a second storage that stores an organic solvent; a mixer that produces the mobile phase by mixing the aqueous solution stored in the first storage with the organic solvent stored in the second storage; a first pipe that connects the mixer to the first storage; a second pipe that connects the mixer to the second storage; and a heater that heats at least a portion of the first pipe and at least a portion of the second pipe, wherein the heater is configured to adjust a temperature of the mobile phase produced by the mixer to a temperature that is equal to or higher than a dissolution temperature of salt included in the aqueous solution, and wherein the column oven includes the heater and heats at least the portion of the first pipe and at least the portion of the second pipe while further storing at least the portion of the first pipe and at least the portion of the second pipe. a first storage that stores an aqueous solution including salt; a second storage that stores an organic solvent; a mixer that produces the mobile phase by mixing the aqueous solution stored in the first storage with the organic solvent stored in the second storage; a first pipe that connects the mixer to the first storage; a second pipe that connects the mixer to the second storage; and a heater that heats at least a portion of the first pipe and at least a portion of the second pipe, wherein the heater is configured to adjust a temperature of the mobile phase produced by the mixer to a temperature that is equal to or higher than a dissolution temperature of salt included in the aqueous solution, and wherein the column oven includes the heater and heats at least the portion of the first pipe and at least the portion of the second pipe while further storing at least the portion of the first pipe and at least the portion of the second pipe.