The present invention relates to a device for joining sets of two or more clothing items, such as socks, gloves or the like, which comprises at least two identical components (1, 1′) that can be coupled to each other, as well as a textile item including entire sets of underwear, home linen etc. that incorporates the device for pairing the items when they are washed, dried or stored, preventing having to search for the correct pair of each item before using them. Each of said components (1, 1′) is in turn divided into an outer part (2, 2′) and an inner part (3, 3′) that are also coupled to each other by inserting ribs (5, 5′) provided on the inner face of the outer part (2, 2′) in the orifice (4, 4′) made in the centre of the inner part (3, 3′), so that they are secured in them; the outer, smooth face can bear advertising symbols.