A specimen processing system comprising: a specimen processing device for processing one or more specimens; a specimen conveyance device including a first conveyance mechanism and a second conveyance mechanism, wherein the first conveyance mechanism is configured to convey a rack supporting one or more specimen containers in a direction from a carry-in side towards a carry-out side on the opposite side of the carry-in side with respect to the specimen processing device through a specimen supply position for supplying the at least one of specimen containers to the specimen processing device and the second conveyance mechanism is configured to convey a rack supporting one or more specimen containers in the direction from the carry-in side towards the carry-out side without passing the specimen supply position; a first control device for controlling the first conveyance mechanism; and a second control device for controlling the second conveyance mechanism, wherein the first conveyance mechanism includes; a first rack conveyance portion for linearly conveying the rack from an accepting position to a sending position through the specimen supply position, a first rack holder configured to supply the rack to the accepting position, and a first sending portion configured to send the rack positioned at the sending position, wherein the second conveyance mechanism includes; a second rack conveyance portion, as a bypass conveyance mechanism, for linearly conveying the rack from a carry-in position of carrying in the rack from a device on an upstream side of conveyance to a carry-out position of carrying out the rack to a device on a downstream side of conveyance without passing the specimen supply position, a second rack holder configured to receive the rack which the first sending portion has sent from the sending position and to supply the received rack to the second rack conveyance portion, and a second sending portion configured to send the rack positioned at the carrying-in position to the first rack holder, wherein the first and second rack holders (33, 34) are arranged between the first and second rack conveyance portions (35, 321), wherein the first control device is configured to control the first conveyance mechanism independent from the second control device, and wherein the first control device is configured to control the first conveyance mechanism when the second control device is stopping a control of the second conveyance mechanism. a specimen processing device for processing one or more specimens; a specimen conveyance device including a first conveyance mechanism and a second conveyance mechanism, wherein the first conveyance mechanism is configured to convey a rack supporting one or more specimen containers in a direction from a carry-in side towards a carry-out side on the opposite side of the carry-in side with respect to the specimen processing device through a specimen supply position for supplying the at least one of specimen containers to the specimen processing device and the second conveyance mechanism is configured to convey a rack supporting one or more specimen containers in the direction from the carry-in side towards the carry-out side without passing the specimen supply position; a first control device for controlling the first conveyance mechanism; and a second control device for controlling the second conveyance mechanism, wherein the first conveyance mechanism includes; a first rack conveyance portion for linearly conveying the rack from an accepting position to a sending position through the specimen supply position, a first rack holder configured to supply the rack to the accepting position, and a first sending portion configured to send the rack positioned at the sending position, wherein the second conveyance mechanism includes; a second rack conveyance portion, as a bypass conveyance mechanism, for linearly conveying the rack from a carry-in position of carrying in the rack from a device on an upstream side of conveyance to a carry-out position of carrying out the rack to a device on a downstream side of conveyance without passing the specimen supply position, a second rack holder configured to receive the rack which the first sending portion has sent from the sending position and to supply the received rack to the second rack conveyance portion, and a second sending portion configured to send the rack positioned at the carrying-in position to the first rack holder, wherein the first and second rack holders (33, 34) are arranged between the first and second rack conveyance portions (35, 321),