An accommodative intraocular lens to be installed in a lens capsule whose anterior capsule has been incised in ophthalmic surgery, the accommodative intraocular lens comprising: an optical portion; and one or a plurality of support portions arranged around the optical portion to support the optical portion, wherein the support portion is composed of an anterior support portion provided in a manner as to come into contact with an inner surface of an anterior capsule and a posterior support portion provided in a manner as to come into contact with an inner surface of a posterior capsule, and is configured such that the anterior support portion presses the anterior capsule and the posterior support portion presses the posterior capsule by an elastic force of the support portion, wherein the anterior support portion extends with a gentle curve radially inward and forward from a base end portion connected to the posterior support portion and then sharply curves at a curved portion and gradually extends radially inward and backward, and a tip end portion of the anterior support portion is connected to a peripheral portion of the optical portion, wherein the anterior support portion is formed with notches extending circumferentially on - the inner surface of the base end portion, - the inner surface of the sharply curved curved portion, and - the outer surface of the tip end portion, wherein when the lens capsule is in a distance vision state, as a pressing force on the anterior support portion by the anterior capsule increases, the anterior support portion deflects backward while maintaining a radial position of the base end portion, so that the tip end portion of the anterior support portion moves backward while maintaining its radial position, so that the optical portion moves backward accordingly, and wherein when the lens capsule is in a near vision state, as the pressing force on the anterior support portion by the anterior capsule decreases, the anterior support portion returns forward by the elastic force of the support portion while maintaining the radial position of the base end portion, so that the tip end portion of the anterior support portion moves forward while maintaining its radial position, so that the optical portion moves forward accordingly. an optical portion; and one or a plurality of support portions arranged around the optical portion to support the optical portion, wherein the support portion is composed of an anterior support portion provided in a manner as to come into contact with an inner surface of an anterior capsule and a posterior support portion provided in a manner as to come into contact with an inner surface of a posterior capsule, and is configured such that the anterior support portion presses the anterior capsule and the posterior support portion presses the posterior capsule by an elastic force of the support portion, wherein the anterior support portion extends with a gentle curve radially inward and forward from a base end portion connected to the posterior support portion and then sharply curves at a curved portion and gradually extends radially inward and backward, and a tip end portion of the anterior support portion is connected to a peripheral portion of the optical portion, wherein the anterior support portion is formed with notches extending circumferentially on - the inner surface of the base end portion, - the inner surface of the sharply curved curved portion, and - the outer surface of the tip end portion, - the inner surface of the base end portion, - the inner surface of the sharply curved curved portion, and - the outer surface of the tip end portion, wherein when the lens capsule is in a distance vision state, as a pressing force on the anterior support portion by the anterior capsule increases, the anterior support portion deflects backward while maintaining a radial position of the base end portion, so that the tip end portion of the anterior support portion moves backward while maintaining its radial position, so that the optical portion moves backward accordingly, and wherein when the lens capsule is in a near vision state, as the pressing force on the anterior support portion by the anterior capsule decreases, the anterior support portion returns forward by the elastic force of the support portion while maintaining the radial position of the base end portion, so that the tip end portion of the anterior support portion moves forward while maintaining its radial position, so that the optical portion moves forward accordingly.