A work vehicle that travels in a field while carrying out a utility work, the work vehicle comprising: a driving wheel provided in a machine body; a power source for inputting a rotational force to the driving wheel; an output instruction acquisition section for acquiring an output instruction for the power source according to an operation of an operation input unit; a traveling control unit for controlling driving of the power source in accordance with the output instruction; a reservoir section for reserving energy source for driving the power source; a remaining amount detection section for detecting a remaining amount of the energy source in the reservoir section; and a restriction section for restricting a maximum speed of the machine body to a preset speed irrespectively of the output instruction if the remaining amount of the energy source is equal to or smaller than a preset first threshold value, wherein the restriction section is configured to make restriction such that when the remaining amount of the energy source is equal to or smaller than the first threshold value, the maximum speed is progressively decreased in accordance with diminishing of the remaining amount of the energy source; and the work vehicle further comprises: a work unit driven with using the energy source for carrying out the utility work; and a stopping section for stopping driving of the work unit if the remaining amount of the energy source is equal to or smaller than a preset third threshold value, wherein the first threshold value is equal to the third threshold value. a driving wheel provided in a machine body; a power source for inputting a rotational force to the driving wheel; an output instruction acquisition section for acquiring an output instruction for the power source according to an operation of an operation input unit; a traveling control unit for controlling driving of the power source in accordance with the output instruction; a reservoir section for reserving energy source for driving the power source; a remaining amount detection section for detecting a remaining amount of the energy source in the reservoir section; and a restriction section for restricting a maximum speed of the machine body to a preset speed irrespectively of the output instruction if the remaining amount of the energy source is equal to or smaller than a preset first threshold value, wherein the restriction section is configured to make restriction such that when the remaining amount of the energy source is equal to or smaller than the first threshold value, the maximum speed is progressively decreased in accordance with diminishing of the remaining amount of the energy source; and the work vehicle further comprises: a work unit driven with using the energy source for carrying out the utility work; and a stopping section for stopping driving of the work unit if the remaining amount of the energy source is equal to or smaller than a preset third threshold value, wherein the first threshold value is equal to the third threshold value. a work unit driven with using the energy source for carrying out the utility work; and a stopping section for stopping driving of the work unit if the remaining amount of the energy source is equal to or smaller than a preset third threshold value, wherein the first threshold value is equal to the third threshold value.