Folding rule comprising elongate flat members (11, 12) which are hingedly connected in pairs and which each have a longitudinal axis (13, 17), in which a hinge connection having an axis of rotation and having a rivet pin has a first hinge plate which is fixed to a first member, and comprises a second hinge plate which is fastened to a second member, a spring tongue (32, 34) which has a latching portion (36, 46) being formed on the first hinge plate, which latching portion interacts with a first complementary latching portion (62, 66) and with a second complementary latching portion (64, 68) on the second hinge plate in order to latch the hinge connection, by means of spring force, in a first setting and in a second setting different from the first setting when the first member is pivoted relative to the second member about the axis of rotation, characterized in that the latching portion (36, 46) formed on the spring tongue (32, 34) of the first hinge plate, together with the second complementary latching portion (64, 68) on the second hinge plate, latches the hinge connection in an angled position between a folded-in and a folded-out position of the members (11, 12) during pivoting of the first member relative to the second member, the second member having a trough-like recess which receives the first complementary latching portion (62, 66), and the second member having, in the region of a through-hole for the rivet pin of the hinge connection, a rib portion which stabilizes the hinge connection, which extends on a broadside surface of the second member that faces the first member, transversely to its longitudinal axis, below the second complementary latching portion (64, 68) on the second hinge plate and therebeyond, through which rib portion the rivet pin passes. in which a hinge connection having an axis of rotation and having a rivet pin has a first hinge plate which is fixed to a first member, and comprises a second hinge plate which is fastened to a second member, a spring tongue (32, 34) which has a latching portion (36, 46) being formed on the first hinge plate, which latching portion interacts with a first complementary latching portion (62, 66) and with a second complementary latching portion (64, 68) on the second hinge plate in order to latch the hinge connection, by means of spring force, in a first setting and in a second setting different from the first setting when the first member is pivoted relative to the second member about the axis of rotation, characterized in that the latching portion (36, 46) formed on the spring tongue (32, 34) of the first hinge plate, together with the second complementary latching portion (64, 68) on the second hinge plate, latches the hinge connection in an angled position between a folded-in and a folded-out position of the members (11, 12) during pivoting of the first member relative to the second member, the second member having a trough-like recess which receives the first complementary latching portion (62, 66), and the second member having, in the region of a through-hole for the rivet pin of the hinge connection, a rib portion which stabilizes the hinge connection, which extends on a broadside surface of the second member that faces the first member, transversely to its longitudinal axis, below the second complementary latching portion (64, 68) on the second hinge plate and therebeyond, through which rib portion the rivet pin passes.