An elastic crawler with core metals embedded in an endless belt-shaped elastic body made of an elastic material at constant intervals in a crawler circumferential direction, the elastic crawler with core metals having a configuration in which a core metal main body elongated in a crawler width direction of the core metal includes a central engagement portion with which a driving sprocket is engageable, a pair of guide protrusion bases formed at opposite ends of the central engagement portion, and a pair of core metal blade parts extending laterally to opposite sides to each other from the pair of guide protrusion bases, a pair of guide protrusions protrudes from the pair of guide protrusion bases to a crawler inner circumference side, the core metal is embedded in the endless belt-shaped elastic body except for at least the guide protrusions, rollers arrangeable along a ground roll on a top surface of the guide protrusion, and roller disengagement preventing protrusions (23A, 23B; 24A, 24B) respectively protrude in opposite directions of a crawler circumferential direction from the pair of guide protrusion bases (21b, 21b) of the core metal main body, the roller disengagement preventing protrusions (23A, 24A; 23B, 24B) protruding in the crawler circumferential direction to protrude to each other toward respective opposed core metal main bodies of adjacent core metals mesh each other in the crawler width direction, characterised in that ribs (25, 25) are formed that connect the roller disengagement preventing protrusions (24A, 24B) on a side of the core metal blade part among the roller disengagement preventing protrusions (23A, 24A; 23B, 24B) meshing each other in the crawler width direction and the core metal blade parts (21c, 21c). a core metal main body elongated in a crawler width direction of the core metal includes a central engagement portion with which a driving sprocket is engageable, a pair of guide protrusion bases formed at opposite ends of the central engagement portion, and a pair of core metal blade parts extending laterally to opposite sides to each other from the pair of guide protrusion bases, a pair of guide protrusions protrudes from the pair of guide protrusion bases to a crawler inner circumference side, the core metal is embedded in the endless belt-shaped elastic body except for at least the guide protrusions, rollers arrangeable along a ground roll on a top surface of the guide protrusion, and roller disengagement preventing protrusions (23A, 23B; 24A, 24B) respectively protrude in opposite directions of a crawler circumferential direction from the pair of guide protrusion bases (21b, 21b) of the core metal main body, the roller disengagement preventing protrusions (23A, 24A; 23B, 24B) protruding in the crawler circumferential direction to protrude to each other toward respective opposed core metal main bodies of adjacent core metals mesh each other in the crawler width direction, characterised in that ribs (25, 25) are formed that connect the roller disengagement preventing protrusions (24A, 24B) on a side of the core metal blade part among the roller disengagement preventing protrusions (23A, 24A; 23B, 24B) meshing each other in the crawler width direction and the core metal blade parts (21c, 21c).