A syringe assembly comprising: a first syringe including a first syringe outer cylinder (41, 41A) which has a first mouth portion (43, 43A) formed to project at a distal portion thereof and is configured to be filled with a first liquid, and a first gasket (42, 42A) which is slidable within the first syringe outer cylinder (41, 41A) and configured to discharge the first liquid through the first mouth portion (43, 43A) by a distal movement; a second syringe including a second syringe outer cylinder (41, 41B) which has a second mouth portion (43, 43B) formed to project at a distal portion thereof and is configured to be filled with a second liquid, and a second gasket (42, 42B) which is slidable within the second syringe outer cylinder (41, 41B) and configured to discharge the second liquid through the second mouth portion (43, 43B) by a distal movement; and a pusher assembly which is configured to perform a pushing operation of collectively moving the first gasket (42, 42A) and the second gasket (42, 42B) in a distal direction, the pusher assembly including a first pusher being rectilinear in shape and having a distal portion configured to be connected to the first gasket (42, 42A), and a second pusher branching from the first pusher, extending distally, having a distal portion configured to be connected to the second gasket (42, 42B); wherein the second pusher has a curved portion where an intermediate portion in a longitudinal direction thereof is curved or bent and a portion of the second portion distal of the curved portion is parallel to the first pusher; wherein the first syringe is greater in inside diameter than the second syringe; wherein the pusher assembly further includes an operation section provided on a proximal-side extension line of the first pusher and operated when performing the pushing operation, the first syringe and the second syringe are substantially the same in configuration, except for the difference in inside diameter, a pushing force required for moving the first gasket (42, 42A) when discharging the first liquid is greater than a pushing force required for moving the second gasket (42, 42B) when discharging the second liquid, wherein the first liquid is higher than the second liquid in viscosity, and the operation section is composed of a plate-shaped flange, which has a center on a center axis of the first pusher; characterised in that the first mouth portion and the second mouth portion are the same in size. a first syringe including a first syringe outer cylinder (41, 41A) which has a first mouth portion (43, 43A) formed to project at a distal portion thereof and is configured to be filled with a first liquid, and a first gasket (42, 42A) which is slidable within the first syringe outer cylinder (41, 41A) and configured to discharge the first liquid through the first mouth portion (43, 43A) by a distal movement; a second syringe including a second syringe outer cylinder (41, 41B) which has a second mouth portion (43, 43B) formed to project at a distal portion thereof and is configured to be filled with a second liquid, and a second gasket (42, 42B) which is slidable within the second syringe outer cylinder (41, 41B) and configured to discharge the second liquid through the second mouth portion (43, 43B) by a distal movement; and a pusher assembly which is configured to perform a pushing operation of collectively moving the first gasket (42, 42A) and the second gasket (42, 42B) in a distal direction, the pusher assembly including a first pusher being rectilinear in shape and having a distal portion configured to be connected to the first gasket (42, 42A), and a second pusher branching from the first pusher, extending distally, having a distal portion configured to be connected to the second gasket (42, 42B); wherein the second pusher has a curved portion where an intermediate portion in a longitudinal direction thereof is curved or bent and a portion of the second portion distal of the curved portion is parallel to the first pusher; wherein the first syringe is greater in inside diameter than the second syringe; wherein the pusher assembly further includes an operation section provided on a proximal-side extension line of the first pusher and operated when performing the pushing operation, the first syringe and the second syringe are substantially the same in configuration, except for the difference in inside diameter, a pushing force required for moving the first gasket (42, 42A) when discharging the first liquid is greater than a pushing force required for moving the second gasket (42, 42B) when discharging the second liquid, wherein the first liquid is higher than the second liquid in viscosity, and the operation section is composed of a plate-shaped flange, which has a center on a center axis of the first pusher; characterised in that the first mouth portion and the second mouth portion are the same in size.