A lid-opening/closing device for a storage container provided with a container body storing therein an object to be stored, a lid portion forming a bottom portion that is openable and closable with respect to the container body and on which an object to be stored is placed, and four locking mechanisms unlocking and locking the lid portion with respect to the container body, the lid-opening/closing device opening and closing the lid portion with respect to the container body and comprising: a device body on which the storage container is placed; a moving unit that includes four engaging portions (35A-35D), each engaging portion (35A-35D) configured to engage with one of the locking mechanisms when the storage container is placed on the device body, and to perform an unlocking operation to cause the locking mechanism to perform the unlocking and a locking operation to cause the locking mechanism to perform the locking by moving the engaging portion (35A-35D); and two container-securing units (80A,80B), each container-securing unit (80A,80B) configured to secure the container body to the device body in conjunction with the moving unit when the locking mechanisms are caused to perform the unlocking, wherein the moving unit comprises: four rotating members (34A-34D), each rotating member (34A-34D) rotatably supported by the device body and configured to move one of the engaging portions (35A-35D), the engaging portion (35A-35D) disposed on the rotating member (34A-34D); two connecting members (37A, 37B), each connecting member (37A, 37B) configured to rotate a pair of rotating members (34A-34D); and an actuator that is attached to the device body and configured to impart a driving force to the connecting members (37A, 37B), each of the container-securing units (80A,80B) further comprises: a lever portion (81A, 81B) a base-end side of which is rotatably supported by the device body and a leading-end side of which is movable, a pressing member that is attached to the leading-end side of the lever portion (81A, 81B) and capable of abutting and separating from the container body, and a biasing member (85A, 85B) configured to bias the pressing member toward the container body, and wherein each of the connecting members (37A, 37B) comprises a linkage member (45A, 45B) configured to separate the pressing member from the container body in a direction against a biasing force of the biasing member (85A, 85B) when the locking operation is performed, and to operate to allow the biasing member (85A, 85B) to bias the pressing member when the unlocking operation is performed. a device body on which the storage container is placed; a moving unit that includes four engaging portions (35A-35D), each engaging portion (35A-35D) configured to engage with one of the locking mechanisms when the storage container is placed on the device body, and to perform an unlocking operation to cause the locking mechanism to perform the unlocking and a locking operation to cause the locking mechanism to perform the locking by moving the engaging portion (35A-35D); and two container-securing units (80A,80B), each container-securing unit (80A,80B) configured to secure the container body to the device body in conjunction with the moving unit when the locking mechanisms are caused to perform the unlocking, wherein the moving unit comprises: four rotating members (34A-34D), each rotating member (34A-34D) rotatably supported by the device body and configured to move one of the engaging portions (35A-35D), the engaging portion (35A-35D) disposed on the rotating member (34A-34D); two connecting members (37A, 37B), each connecting member (37A, 37B) configured to rotate a pair of rotating members (34A-34D); and an actuator that is attached to the device body and configured to impart a driving force to the connecting members (37A, 37B), four rotating members (34A-34D), each rotating member (34A-34D) rotatably supported by the device body and configured to move one of the engaging portions (35A-35D), the engaging portion (35A-35D) disposed on the rotating member (34A-34D); two connecting members (37A, 37B), each connecting member (37A, 37B) configured to rotate a pair of rotating members (34A-34D); and an actuator that is attached to the device body and configured to impart a driving force to the connecting members (37A, 37B), each of the container-securing units (80A,80B) further comprises: a lever portion (81A, 81B) a base-end side of which is rotatably supported by the device body and a leading-end side of which is movable, a pressing member that is attached to the leading-end side of the lever portion (81A, 81B) and capable of abutting and separating from the container body, and a biasing member (85A, 85B) configured to bias the pressing member toward the container body, and a lever portion (81A, 81B) a base-end side of which is rotatably supported by the device body and a leading-end side of which is movable, a pressing member that is attached to the leading-end side of the lever portion (81A, 81B) and capable of abutting and separating from the container body, and a biasing member (85A, 85B) configured to bias the pressing member toward the container body, and wherein each of the connecting members (37A, 37B) comprises a linkage member (45A, 45B) configured to separate the pressing member from the container body in a direction against a biasing force of the biasing member (85A, 85B) when the locking operation is performed, and to operate to allow the biasing member (85A, 85B) to bias the pressing member when the unlocking operation is performed.