A lattice structure to be used for a work machine and configured to be detachably coupled to a counterpart lattice structure adjacent to the lattice structure, the lattice structure comprising: a plurality of main pipes arranged at an interval in a radial direction; a plurality of inclined pipes extending so as to be inclined with respect to an axial direction of each of the plurality of main pipes in a posture not orthogonal to the axial direction, each of the plurality of inclined pipes coupling any two of the plurality of main pipes to each other; and a plurality of connectors to be detachably coupled to a plurality of counterpart connectors included in the counterpart lattice structure, wherein the plurality of connectors include a predetermined connector having a main pipe connecting portion to which an end portion of any one of the plurality of main pipes is connected, and an inclined pipe connecting portion to which an end portion of one of the plurality of inclined pipes is connected, and the predetermined connector has a pin insertion hole into which a coupling pin is to be inserted, and is configured such that the predetermined connector is connected to the counterpart connector by inserting the coupling pin into the pin insertion hole and a pin insertion hole formed in the counterpart connector which corresponds to the predetermined connector, characterized in that both a center axis line of the main pipe connected to the main pipe connecting portion and a center axis line of the inclined pipe connected to the inclined pipe connecting portion pass through a region surrounded by an inner peripheral surface which defines the pin insertion hole of the predetermined connector. a plurality of main pipes arranged at an interval in a radial direction; a plurality of inclined pipes extending so as to be inclined with respect to an axial direction of each of the plurality of main pipes in a posture not orthogonal to the axial direction, each of the plurality of inclined pipes coupling any two of the plurality of main pipes to each other; and a plurality of connectors to be detachably coupled to a plurality of counterpart connectors included in the counterpart lattice structure, wherein the plurality of connectors include a predetermined connector having a main pipe connecting portion to which an end portion of any one of the plurality of main pipes is connected, and an inclined pipe connecting portion to which an end portion of one of the plurality of inclined pipes is connected, and the predetermined connector has a pin insertion hole into which a coupling pin is to be inserted, and is configured such that the predetermined connector is connected to the counterpart connector by inserting the coupling pin into the pin insertion hole and a pin insertion hole formed in the counterpart connector which corresponds to the predetermined connector, characterized in that both a center axis line of the main pipe connected to the main pipe connecting portion and a center axis line of the inclined pipe connected to the inclined pipe connecting portion pass through a region surrounded by an inner peripheral surface which defines the pin insertion hole of the predetermined connector.