Rubber crawler and core

A rubber crawler comprising:

• an endless crawler body made of rubber, and
• a plurality of cores embedded in the crawler body and arranged along a crawler circumferential direction, wherein
• each of the cores comprises:
• a base portion extending in a crawler width direction,
• a pair of horn portions extending from the base portion to a crawler inner circumferential side,
• a pair of first projections extending from the base portion to a crawler circumferential direction first side, and
• a pair of second projections extending from the base portion to a crawler circumferential direction second side, wherein
• the pair of first projections of each of the cores respectively face the pair of second projections of another core adjacent to the core on the crawler circumferential direction first side in the crawler width direction,
• at least a first projection on a crawler width direction first side in the pair of first projections of each of the cores has a first recess on a surface facing the second projection of another core,
• the first recess is configured such that an end on a side of a tip of the first projection in the crawler circumferential direction of the first recess is positioned closer to a side of a root of the first projection than the tip of the first projection in the crawler circumferential direction,
• the first recess is configured such that, in a portion including at least the end on the side of the tip of the first projection in the crawler circumferential direction, a length in the crawler width direction increases as it goes toward the side of the root of the first projection in the crawler circumferential direction,
• the first recess is open on a crawler inner circumferential side and closed on a crawler outer circumferential side, and
• the first recess has a substantially triangular prism shape.