A stabilizer leg device with a stabilizer leg to be moved downwards from an object, such as a crane vehicle, so as to stabilise this object by bearing through a footplate secured to a lower end of the stabilizer leg onto a support layer on which the object is resting, said device comprising • a power member of the length varying type forming the stabilizer leg and configured to have a first stabilizer leg member thereof pivotally connecting an end of the stabilizer leg to said object about an horizontal axis when the object is resting on horizontal ground and a second stabilizer leg member provided with the footplate and extendable and retractable with respect to the first stabilizer leg member in a direction perpendicular to said horizontal axis for length variation of the stabilizer leg, and • an arrangement configured to control the stabilizer leg to be moved from a working position of the stabilizer leg device with the footplate bearing on the ground to a parking position in which the footplate points upwards upon a retraction of the second stabilizer leg member with respect to the first stabilizer leg member causing a pivoting of this and by that the stabilizer leg about said horizontal axis, and from the parking position to the working position upon extension of the second stabilizer leg member with respect to the first stabilizer leg member, said arrangement comprising a first engagement member configured to be arranged coaxially to said horizontal axis on a part fixed with respect to said object and a shaft having a first end provided with a second engagement member and an opposite second end arranged to be influenced by movement of the second stabilizer leg member with respect to the first stabilizer leg member to make the shaft slide along the stabilizer leg under said extension and retraction of the stabilizer leg so as to cause pivoting of the stabilizer leg by engagement of said second engagement member with said first engagement member during extension and retraction of the stabilizer leg, characterized in that said arrangement comprises guiding members (16, 17) configured to in a said working position of the stabilizer leg device and upon retraction of the stabilizer leg therefrom to a position of predetermined extension degree of said second stabilizer leg member with respect to the first stabilizer leg member prevent pivoting of the stabilizer leg about said horizontal axis by guiding said shaft to slide vertically and upon reaching said predetermined position to interrupt said guiding and allow the stabilizer leg to pivot about said horizontal axis, and that said second engagement member is positioned on said shaft to enter into engagement with the first engagement member when the second stabilizer leg member is reaching said predetermined position in a stabilizer leg retraction movement and to leave said engagement when reaching said predetermined position in a stabilizer leg extension movement so as to automatically unlock and lock, respectively, the stabilizer leg with respect to possibility to pivot about said horizontal axis by passing said predetermined position by the second stabilizer leg member. • a power member of the length varying type forming the stabilizer leg and configured to have a first stabilizer leg member thereof pivotally connecting an end of the stabilizer leg to said object about an horizontal axis when the object is resting on horizontal ground and a second stabilizer leg member provided with the footplate and extendable and retractable with respect to the first stabilizer leg member in a direction perpendicular to said horizontal axis for length variation of the stabilizer leg, and • an arrangement configured to control the stabilizer leg to be moved from a working position of the stabilizer leg device with the footplate bearing on the ground to a parking position in which the footplate points upwards upon a retraction of the second stabilizer leg member with respect to the first stabilizer leg member causing a pivoting of this and by that the stabilizer leg about said horizontal axis, and from the parking position to the working position upon extension of the second stabilizer leg member with respect to the first stabilizer leg member,