A traveling work machine that is configured to alternately and repeatedly perform s a plurality of instances of work travel, in which a working device performs work while the traveling work machine automatically travels in a field along a pre-set target heading, and turning travel, in which the traveling work machine moves from an end position (Lf) of the work travel to a start position of next work travel in an unworked part of the field while switching to a direction opposite from the travel direction of the work travel, the traveling work machine comprising: a position detection unit that is configured to obtain position information of a machine body on the basis of a positioning signal of a navigation satellite; an end determination unit capable of determining an end of each of a plurality of instances of the work travel; a start position calculation unit that is configured to calculate the start position (Ls, Ls2); a display unit capable of displaying information pertaining to the turning travel, and a maneuvering tool through which a maneuvering operation of the machine body can be performed by a human, wherein when the end determination unit determines the end of the work travel, the start position calculation unit calculates, on the basis of the position information, the start position to be on one of a left and a right of a travel direction of the machine body in the work travel, and the display unit displays guidance information guiding the turning travel to the start position, wherein: a map screen configured to display the machine body and surroundings of the machine body is included in the guidance information, when, in the turning travel, the maneuvering tool is operated in a turn direction to a side opposite from the side on which the start position calculation unit has calculated the start position, the start position calculation unit re-calculates the start position in a turn direction on the side to which the maneuvering tool has been operated, and the display unit re-displays the start position further in the turn direction on the side to which the maneuvering tool has been operated than the machine body in the map screen. a position detection unit that is configured to obtain position information of a machine body on the basis of a positioning signal of a navigation satellite; an end determination unit capable of determining an end of each of a plurality of instances of the work travel; a start position calculation unit that is configured to calculate the start position (Ls, Ls2); a display unit capable of displaying information pertaining to the turning travel, and a maneuvering tool through which a maneuvering operation of the machine body can be performed by a human, wherein when the end determination unit determines the end of the work travel, the start position calculation unit calculates, on the basis of the position information, the start position to be on one of a left and a right of a travel direction of the machine body in the work travel, and the display unit displays guidance information guiding the turning travel to the start position, wherein: a map screen configured to display the machine body and surroundings of the machine body is included in the guidance information, when, in the turning travel, the maneuvering tool is operated in a turn direction to a side opposite from the side on which the start position calculation unit has calculated the start position, the start position calculation unit re-calculates the start position in a turn direction on the side to which the maneuvering tool has been operated, and the display unit re-displays the start position further in the turn direction on the side to which the maneuvering tool has been operated than the machine body in the map screen. a map screen configured to display the machine body and surroundings of the machine body is included in the guidance information, when, in the turning travel, the maneuvering tool is operated in a turn direction to a side opposite from the side on which the start position calculation unit has calculated the start position, the start position calculation unit re-calculates the start position in a turn direction on the side to which the maneuvering tool has been operated, and the display unit re-displays the start position further in the turn direction on the side to which the maneuvering tool has been operated than the machine body in the map screen.