The present invention relates to a piece of modular furniture, comprising a set of elements which can be coupled by fitting to one another, wherein the set of elements comprises at least two pairs of vertical posts, wherein each vertical posts has housings in which conformations of horizontal slats are introduced, and at least one shelf having indentations which can be fitted to the vertical posts, and in that the two vertical posts of each pair reach the end user in a manner in which they are joined to one another by means of the horizontal slats, such that they form a single, ladder-like assembly unit; such that at least one shelf is supported at its ends on the horizontal slats with the vertical posts fitted in the indentations of the shelf, constituting the corresponding furniture just like that.