Openess and Density Theorems of Transversality in Manifolds with Corners S. Armas-G\'omez, J. Margalef-Roig, E. Outerelo-Dom\'{\i}nguez and E. Padr\'on-Fern\'andez Abstract. In this paper we deal with infinitesimal transversality, transversality, boundary-transversality and weak-boundary-transversality defined on manifolds with corners. We prove openess theorems about these types of transversality. The main theorem concerns the residuality of the jet-transversality (boundary-transversality and weak-boundary-transversality). 1991 Mathematics Subject Classification. Primary: 58C25, 58D15. Secondary: 58C27. Key words and phrases: Transversality, boundary-transversality, weak-boundary-transversality, infinitesimal transversality, Abraham-Quinn parametrized theorems of the density of the transversality, openess of transversality, Thom Density theorem of Transversality.