A lens apparatus that includes an optical system including a lens disposed closest to an object side of the optical system, a positive lens (Gp) disposed on an image side of the lens and a negative lens (Gn) disposed adjacent to the positive lens (Gp), the lens apparatus comprising: a holding member arranged to hold the positive lens (Gp) and the negative lens (Gn); and an exterior member arranged to engage with the holding member and to accommodate the holding member,the positive lens (Gp) is arranged closest to the object side among every lens made of a material having negative temperature coefficient of a refractive index disposed on the image side of the lens, and wherein assuming that a first plane is a plane that passes through a point on the object side surface of the positive lens (Gp), positioned closest to an object, and that the first plane is perpendicular to the optical axis of the optical system, and a second plane is a plane that passes through a point on the image side surface of the positive lens (Gp), positioned closest to an image, and that the second plane is perpendicular to the optical axis of the optical system, the holding member and the exterior member are disposed so as to be separated from each other with an air gap in between in a region between the first plane and the second plane, wherein assuming that a third plane is a plane that passes through a point on the object side surface of the negative lens (Gn), positioned closest to an object, and that the third plane is perpendicular to the optical axis of the optical system, and a fourth plane is a plane that passes through a point on the image side surface of the negative lens (Gn), positioned closest to an image, and that the fourth plane is perpendicular to the optical axis of the optical system, the holding member and the exterior member are disposed so as to be separated from each other with an air gap in between in a region between the third plane and the fourth plane, and wherein the holding member and the exterior member are in contact with each other in a first contact region between the lens and the positive lens (Gp). a holding member arranged to hold the positive lens (Gp) and the negative lens (Gn); and an exterior member arranged to engage with the holding member and to accommodate the holding member,the positive lens (Gp) is arranged closest to the object side among every lens made of a material having negative temperature coefficient of a refractive index disposed on the image side of the lens, and wherein assuming that a first plane is a plane that passes through a point on the object side surface of the positive lens (Gp), positioned closest to an object, and that the first plane is perpendicular to the optical axis of the optical system, and a second plane is a plane that passes through a point on the image side surface of the positive lens (Gp), positioned closest to an image, and that the second plane is perpendicular to the optical axis of the optical system, the holding member and the exterior member are disposed so as to be separated from each other with an air gap in between in a region between the first plane and the second plane, wherein assuming that a third plane is a plane that passes through a point on the object side surface of the negative lens (Gn), positioned closest to an object, and that the third plane is perpendicular to the optical axis of the optical system, and a fourth plane is a plane that passes through a point on the image side surface of the negative lens (Gn), positioned closest to an image, and that the fourth plane is perpendicular to the optical axis of the optical system, the holding member and the exterior member are disposed so as to be separated from each other with an air gap in between in a region between the third plane and the fourth plane, and wherein the holding member and the exterior member are in contact with each other in a first contact region between the lens and the positive lens (Gp).