Constant-speed travel apparatus

A constant-speed travel apparatus configured to control a prime mover so that a mobile body mounted with the prime mover travels at a constant speed, comprising:

• a function operation member configured to be instructed activation of a speed maintaining function for maintaining a travel speed of the mobile body in response to operation by an operator;
• a first speed operation member configured to be instructed the travel speed in accordance with an operation amount by the operator;
• a second speed operation member configured to be instructed a change of the travel speed by a predetermined amount in response to operation by the operator in a state where activation of the speed maintaining function has been instructed through the function operation member;
• and
• an electronic control unit configured to control an output of the prime mover based on the operation amount of the first speed operation member and a number of times of operation of the second speed operation member so that the mobile body travels at a constant speed in the state where activation of the speed maintaining function has been instructed through the function operation member, wherein
• the electronic control unit deactivates the speed maintaining function and controls the output of the prime mover based on the travel speed instructed through the first speed operation member when the operation amount of the first speed operation member exceeds a predetermined operation amount in the state where activation of the speed maintaining function has been instructed through the function operation member.