A working machine comprising: a floor portion; a seat stand mounted on the floor portion; an operator seat located on the seat stand and including a seat portion on which an operator sits; an operation base arranged in front of the operator seat; an operation member arranged on the operation base and configured to be gripped and moved; and an armrest member extending from the operation base toward a side of the operator seat, characterized in that the operation base is erected at a position on the floor portion forward of the seat stand and is fixed to the floor portion, and a rear end portion of the armrest member is located in a front-rear direction at a position forward of a center of the seat portion in the front-rear direction, the operation member includes: a first operation handle; and a second operation handle positioned beside the first operation handle, the armrest member includes: a first armrest extending backward from a back side of the first operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction; and a second armrest extending backward from a back side of the second operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction, the first armrest and the second armrest are arranged to have opposed surfaces that extend backward gradually separating from each other, the working machine comprises: a traveling device; a traveling operation member arranged on the floor portion and configured to operate the traveling device in accordance with a pedaling operation, the traveling operation member includes: a first traveling pedal arranged below the first armrest to be overlapped with the first armrest in plan view; and a second traveling pedal arranged below the second armrest to be overlapped with the second armrest in plan view. a floor portion; a seat stand mounted on the floor portion; an operator seat located on the seat stand and including a seat portion on which an operator sits; an operation base arranged in front of the operator seat; an operation member arranged on the operation base and configured to be gripped and moved; and an armrest member extending from the operation base toward a side of the operator seat, characterized in that the operation base is erected at a position on the floor portion forward of the seat stand and is fixed to the floor portion, and a rear end portion of the armrest member is located in a front-rear direction at a position forward of a center of the seat portion in the front-rear direction, the operation member includes: a first operation handle; and a second operation handle positioned beside the first operation handle, a first operation handle; and a second operation handle positioned beside the first operation handle, the armrest member includes: a first armrest extending backward from a back side of the first operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction; and a second armrest extending backward from a back side of the second operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction, the first armrest and the second armrest are arranged to have opposed surfaces that extend backward gradually separating from each other, a first armrest extending backward from a back side of the first operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction; and a second armrest extending backward from a back side of the second operation handle and including a rear end portion positioned in the front-rear direction forward of the center of the seat portion in the front-rear direction, the first armrest and the second armrest are arranged to have opposed surfaces that extend backward gradually separating from each other, the working machine comprises: a traveling device; a traveling operation member arranged on the floor portion and configured to operate the traveling device in accordance with a pedaling operation, the traveling operation member includes: a first traveling pedal arranged below the first armrest to be overlapped with the first armrest in plan view; and a second traveling pedal arranged below the second armrest to be overlapped with the second armrest in plan view. a traveling device; a traveling operation member arranged on the floor portion and configured to operate the traveling device in accordance with a pedaling operation, the traveling operation member includes: a first traveling pedal arranged below the first armrest to be overlapped with the first armrest in plan view; and a second traveling pedal arranged below the second armrest to be overlapped with the second armrest in plan view. a first traveling pedal arranged below the first armrest to be overlapped with the first armrest in plan view; and a second traveling pedal arranged below the second armrest to be overlapped with the second armrest in plan view.