Chair with a frame with tubular elements

A chair with a frame with tubular elements, comprising two inverted V-shaped elements that form front legs and rear legs, are parallel and are joined substantially at an inner curvature to a tubular crossmember, two L-shaped elements connected by said crossmember on which they are arranged in a parallel configuration so as to form a support for a back and for a seat, respectively with first substantially vertical portions thereof and second substantially horizontal portions, said chair being provided with a first locking means for vertical stacking with similar chairs, wherein the chair is provided with four resting plugs for resting on the floor, for closing the ends of said inverted V-shaped elements, of said front legs and of said rear legs, each one of said resting plugs being provided with a second locking means, which comprises a protrusion from the inner part of the corresponding front leg or rear leg, which is shaped substantially complementary to the curvature of the outer surface of the corresponding front leg or rear leg of a similar underlying chair, wherein each one of said inverted V-shaped elements has a reinforcement recess on an inner side of each one of two straight portions that form the front leg and the rear leg, said resting plugs being provided with a portion for insertion in the end portion of each front leg or rear leg that is shaped complementary thereto.