A traveling vehicle comprising: a steering shaft to which a steering handle is attached, the steering shaft having a tilt angle and a length both adjustable; a tilt lock to lock the steering shaft at an adjusted tilt angle; a telescopic lock to lock the steering shaft at an adjusted length; an operation member including an operation area allowing locking by both of the tilt lock and the telescopic lock to be released; an interlocking mechanism to interlock the operation member with the tilt lock and the telescopic lock; and a tilt shaft (25L, 25R) serving as a center of an inclining movement of the steering shaft, wherein the interlocking mechanism includes: a first interlocking to interlock the operation member and the tilt lock; a second interlocking to interlock the first interlocking and the telescopic lock; and a mechanical play preventing the first interlocking and the telescopic lock from being interlocked each other until the operation member is moved a predetermined distance from a position at which the operation member is not moved, the first interlocking includes a release arm to be moved in synchronization with operation of the operation member to release the locking by the tilt lock, the second interlocking includes: a moving member to be moved in synchronization with the operation of the operation member to release the locking by the telescopic lock; and a relay arm interlocked with the release arm by a first relay linkage and interlocked with the moving member by a second relay linkage, the mechanical play is provided to the relay arm and formed of a groove to which one end portion of the second relay linkage is inserted, and the one end portion relatively moves in the groove to prevent the relay arm and the moving member from being interlocked each other until the operation member is moved the predetermined distance, and further moves after the operation member is moved the predetermined distance such that an end portion of the groove contacts to the one end portion to interlock the relay arm and the moving member, characterized in that a center of the one end portion of the second relay linkage coincides with an axis of the tilt shaft (25L, 25R) under a state where the tilt angle of the steering shaft is adjustable and the length of the steering shaft is adjustable. a steering shaft to which a steering handle is attached, the steering shaft having a tilt angle and a length both adjustable; a tilt lock to lock the steering shaft at an adjusted tilt angle; a telescopic lock to lock the steering shaft at an adjusted length; an operation member including an operation area allowing locking by both of the tilt lock and the telescopic lock to be released; an interlocking mechanism to interlock the operation member with the tilt lock and the telescopic lock; and a tilt shaft (25L, 25R) serving as a center of an inclining movement of the steering shaft, wherein the interlocking mechanism includes: a first interlocking to interlock the operation member and the tilt lock; a second interlocking to interlock the first interlocking and the telescopic lock; and a mechanical play preventing the first interlocking and the telescopic lock from being interlocked each other until the operation member is moved a predetermined distance from a position at which the operation member is not moved, a first interlocking to interlock the operation member and the tilt lock; a second interlocking to interlock the first interlocking and the telescopic lock; and a mechanical play preventing the first interlocking and the telescopic lock from being interlocked each other until the operation member is moved a predetermined distance from a position at which the operation member is not moved, the first interlocking includes a release arm to be moved in synchronization with operation of the operation member to release the locking by the tilt lock, the second interlocking includes: a moving member to be moved in synchronization with the operation of the operation member to release the locking by the telescopic lock; and a relay arm interlocked with the release arm by a first relay linkage and interlocked with the moving member by a second relay linkage, a moving member to be moved in synchronization with the operation of the operation member to release the locking by the telescopic lock; and a relay arm interlocked with the release arm by a first relay linkage and interlocked with the moving member by a second relay linkage, the mechanical play is provided to the relay arm and formed of a groove to which one end portion of the second relay linkage is inserted, and the one end portion relatively moves in the groove to prevent the relay arm and the moving member from being interlocked each other until the operation member is moved the predetermined distance, and further moves after the operation member is moved the predetermined distance such that an end portion of the groove contacts to the one end portion to interlock the relay arm and the moving member, characterized in that a center of the one end portion of the second relay linkage coincides with an axis of the tilt shaft (25L, 25R) under a state where the tilt angle of the steering shaft is adjustable and the length of the steering shaft is adjustable.