A working vehicle comprising: a cabin; and an outside air inlet portion configured to take outside air that is to be introduced to the cabin; a filter device through which the outside air taken from the outside air inlet portion passes, having: a first filter providing a first filtering level; and a second filter providing a second filtering level that is a filtering level higher than the first filtering level; an air conditioning unit to which the outside air having passed through the filter device is supplied; and a filter changing mechanism having: a first state to allow the outside air to pass through only the first filter; and a second state to allow the outside air to pass through at least the second filter among the first filter and the second filter, the filter changing mechanism being configured to be selectively switched to the first state or the second state, the outside air inlet portion including: a first outside air inlet portion arranged on one side of the cabin in a width direction of the cabin; and a second outside air inlet portion arranged on the other side of the cabin in the width direction of the cabin, characterized in that the first filter includes: a one-side filter through which the outside air taken from the first outside air inlet portion passes; and an other-side filter through which the outside air taken from the second outside air inlet portion passes, and the filter changing mechanism allows the outside air to pass through both of the first filter and the second filter under the second state. a cabin; and an outside air inlet portion configured to take outside air that is to be introduced to the cabin; a filter device through which the outside air taken from the outside air inlet portion passes, having: a first filter providing a first filtering level; and a second filter providing a second filtering level that is a filtering level higher than the first filtering level; a first filter providing a first filtering level; and a second filter providing a second filtering level that is a filtering level higher than the first filtering level; an air conditioning unit to which the outside air having passed through the filter device is supplied; and a filter changing mechanism having: a first state to allow the outside air to pass through only the first filter; and a second state to allow the outside air to pass through at least the second filter among the first filter and the second filter, a first state to allow the outside air to pass through only the first filter; and a second state to allow the outside air to pass through at least the second filter among the first filter and the second filter, the filter changing mechanism being configured to be selectively switched to the first state or the second state, the outside air inlet portion including: a first outside air inlet portion arranged on one side of the cabin in a width direction of the cabin; and a second outside air inlet portion arranged on the other side of the cabin in the width direction of the cabin, a first outside air inlet portion arranged on one side of the cabin in a width direction of the cabin; and a second outside air inlet portion arranged on the other side of the cabin in the width direction of the cabin, characterized in that the first filter includes: a one-side filter through which the outside air taken from the first outside air inlet portion passes; and an other-side filter through which the outside air taken from the second outside air inlet portion passes, a one-side filter through which the outside air taken from the first outside air inlet portion passes; and an other-side filter through which the outside air taken from the second outside air inlet portion passes, and the filter changing mechanism allows the outside air to pass through both of the first filter and the second filter under the second state.