A mixing container for mixing multiple materials, comprising: a container body including a storage part storing the materials, the storage part having at least one partition wall formed such that a portion of an inner wall surface forming the storage part is raised toward a storage space, the partition wall forming multiple storage chambers (72, 73) capable of separately storing the materials in the storage part; a lid member attached to the container body to seal a circumferential edge of the storage part and an upper edge of the partition wall partitioning the multiple storage chambers (72, 73) from each other such that the multiple storage chambers (72, 73) are separately sealed, and a handle part having a coupling part coupled to the partition wall and an operating part configured to be operated by a user, wherein the operating part is made up of a pair of members extending from the coupling part to sides opposite to each other, the handle part includes a receiving part configured to receive at least a portion of the container body coupled to the coupling part, the receiving part is configured such that a circumferential edge of the receiving part and the container body are flush with each other when receiving the container body, the lid member includes a tab, and wherein the tab is disposed along the handle part, the mixing container is configured such that, as the operating part relatively moves in a direction from the lid member toward the container body with respect to the container body, the partition wall moves together with the coupling part in the direction from the lid member toward the container body, the partition wall is configured to be deformable into a concave part recessed in a movement direction of the partition wall through movement in a direction from the lid member toward the container body with the circumferential edge of the storage part sealed to the lid member and wherein when the partition wall is deformed into the concave part, the multiple storage chambers (72, 73) formed by the partition wall are deformed into one storage chamber. a container body including a storage part storing the materials, the storage part having at least one partition wall formed such that a portion of an inner wall surface forming the storage part is raised toward a storage space, the partition wall forming multiple storage chambers (72, 73) capable of separately storing the materials in the storage part; a lid member attached to the container body to seal a circumferential edge of the storage part and an upper edge of the partition wall partitioning the multiple storage chambers (72, 73) from each other such that the multiple storage chambers (72, 73) are separately sealed, and a handle part having a coupling part coupled to the partition wall and an operating part configured to be operated by a user, wherein the operating part is made up of a pair of members extending from the coupling part to sides opposite to each other, the handle part includes a receiving part configured to receive at least a portion of the container body coupled to the coupling part, the receiving part is configured such that a circumferential edge of the receiving part and the container body are flush with each other when receiving the container body, the lid member includes a tab, and wherein the tab is disposed along the handle part, the mixing container is configured such that, as the operating part relatively moves in a direction from the lid member toward the container body with respect to the container body, the partition wall moves together with the coupling part in the direction from the lid member toward the container body, the partition wall is configured to be deformable into a concave part recessed in a movement direction of the partition wall through movement in a direction from the lid member toward the container body with the circumferential edge of the storage part sealed to the lid member and wherein when the partition wall is deformed into the concave part, the multiple storage chambers (72, 73) formed by the partition wall are deformed into one storage chamber.