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 (T1) that is a period of time for which an object (M2) located in a monitored area (Q2) monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object (M2) as an obstacle if the detection time (T1) calculated by the first time calculation unit is equal to or greater than a first threshold (T10). 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 (T1) that is a period of time for which an object (M2) located in a monitored area (Q2) monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object (M2) as an obstacle if the detection time (T1) calculated by the first time calculation unit is equal to or greater than a first threshold (T10). 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 (T1) that is a period of time for which an object (M2) located in a monitored area (Q2) monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object (M2) as an obstacle if the detection time (T1) calculated by the first time calculation unit is equal to or greater than a first threshold (T10). a first time calculation unit configured to calculate a detection time (T1) that is a period of time for which an object (M2) located in a monitored area (Q2) monitored for detecting the obstacles is detected; and a first obstacle determination unit configured to determine the object (M2) as an obstacle if the detection time (T1) calculated by the first time calculation unit is equal to or greater than a first threshold (T10). <EOS>