Escalator/moving walkway modular truss comprising an upper module, a central module, and a lower module, each module (1,2,3) comprising - a first side and a second side opposite to the first side, each side (4,5) of the modules (1,2,3) comprising in turn a lower profile and an upper profile, and - a soffit plate placed between both sides (4,5), - wherein the modules (1,2,3) comprise - a plurality of vertical beams placed between the lower profile and the upper profile of each side (4,5), said vertical beams being vertical guide supports configured for supporting and positioning the guiding system of the escalator/moving walkway, - a plurality of diagonal beams between the lower profile and the upper profile of each side (4,5), - and a plurality of crossbars between both sides (4,5), each crossbar placed between a pair of opposite vertical guide supports, - wherein the lower profiles are a direct support for an outer cladding of the escalator/moving walkway, CHARACTERIZED IN THAT - each of the lower profiles includes several protuberances on both sides to allow connections, - wherein the upper profiles are a direct support for balustrades and outer decking profiles of the escalator/moving walkway, - each of the upper profiles has two differentiated parts, which are an upper part and a lower part, - wherein the upper part is wider than the lower part, - wherein the lower part is an open part being directly connected to the vertical beams and the diagonal beams with several protuberances to allow connections, and - wherein the upper part includes a plurality of shapes to connect the outer decking profile in an outer side and the balustrade in an inner side. - a first side and a second side opposite to the first side, each side (4,5) of the modules (1,2,3) comprising in turn a lower profile and an upper profile, and - a soffit plate placed between both sides (4,5), - wherein the modules (1,2,3) comprise - a plurality of vertical beams placed between the lower profile and the upper profile of each side (4,5), said vertical beams being vertical guide supports configured for supporting and positioning the guiding system of the escalator/moving walkway, - a plurality of diagonal beams between the lower profile and the upper profile of each side (4,5), - and a plurality of crossbars between both sides (4,5), each crossbar placed between a pair of opposite vertical guide supports, - a plurality of vertical beams placed between the lower profile and the upper profile of each side (4,5), said vertical beams being vertical guide supports configured for supporting and positioning the guiding system of the escalator/moving walkway, - a plurality of diagonal beams between the lower profile and the upper profile of each side (4,5), - and a plurality of crossbars between both sides (4,5), each crossbar placed between a pair of opposite vertical guide supports, - wherein the lower profiles are a direct support for an outer cladding of the escalator/moving walkway, - each of the lower profiles includes several protuberances on both sides to allow connections, - wherein the upper profiles are a direct support for balustrades and outer decking profiles of the escalator/moving walkway, - each of the upper profiles has two differentiated parts, which are an upper part and a lower part, - wherein the upper part is wider than the lower part, - wherein the lower part is an open part being directly connected to the vertical beams and the diagonal beams with several protuberances to allow connections, and - wherein the upper part includes a plurality of shapes to connect the outer decking profile in an outer side and the balustrade in an inner side.