A working vehicle comprising: a vehicle body; a linkage provided on the vehicle body and configured to link a working device; a control device configured to cause the vehicle body to perform automatic travel; a rear obstacle detecting device configured to detect obstacles behind the vehicle body during the automatic travel; and a setting change unit configured to change rear setting information regarding obstacle detection performed by the rear obstacle detecting device, wherein: the working vehicle is configured to perform work by the working device during the automatic travel, characterized in that the rear setting information includes a size of an obj ect to be determined as an obstacle, the setting change unit is configured to set, according to the work or a type of the working device, the size of the object to be determined as an obstacle, and the rear obstacle detecting device includes: a first time calculation unit configured to calculate a detection time that is a period of time for which an object located in a monitored area monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object as an obstacle if the detection time calculated by the first time calculation unit is equal to or greater than a first threshold. a vehicle body; a linkage provided on the vehicle body and configured to link a working device; a control device configured to cause the vehicle body to perform automatic travel; a rear obstacle detecting device configured to detect obstacles behind the vehicle body during the automatic travel; and a setting change unit configured to change rear setting information regarding obstacle detection performed by the rear obstacle detecting device, wherein: the working vehicle is configured to perform work by the working device during the automatic travel, characterized in that the rear setting information includes a size of an obj ect to be determined as an obstacle, the setting change unit is configured to set, according to the work or a type of the working device, the size of the object to be determined as an obstacle, and the rear obstacle detecting device includes: a first time calculation unit configured to calculate a detection time that is a period of time for which an object located in a monitored area monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object as an obstacle if the detection time calculated by the first time calculation unit is equal to or greater than a first threshold. the working vehicle is configured to perform work by the working device during the automatic travel, characterized in that the rear setting information includes a size of an obj ect to be determined as an obstacle, the setting change unit is configured to set, according to the work or a type of the working device, the size of the object to be determined as an obstacle, and the rear obstacle detecting device includes: a first time calculation unit configured to calculate a detection time that is a period of time for which an object located in a monitored area monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object as an obstacle if the detection time calculated by the first time calculation unit is equal to or greater than a first threshold. a first time calculation unit configured to calculate a detection time that is a period of time for which an object located in a monitored area monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object as an obstacle if the detection time calculated by the first time calculation unit is equal to or greater than a first threshold.