Folding rule comprising elongate flat members which are hingedly connected in pairs and which each have a longitudinal axis , 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 which has a latching portion being formed on the first hinge plate , which latching portion interacts with a first complementary latching portion and with a second complementary latching portion 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 formed on the spring tongue of the first hinge plate , together with the second complementary latching portion 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 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 , 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 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 which has a latching portion being formed on the first hinge plate , which latching portion interacts with a first complementary latching portion and with a second complementary latching portion 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 formed on the spring tongue of the first hinge plate , together with the second complementary latching portion 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 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 , 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 on the second hinge plate and therebeyond, through which rib portion the rivet pin passes. <EOS>