One or more eyepiece lenses, one or more observation apparatuses and one or more imaging apparatuses are discussed herein. In at least one embodiment, an eyepiece lens comprises, in order from an object side to an observation side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power, wherein a focal length of the fifth lens is shorter than a focal length of the third lens, and the focal length of the third lens is shorter than a focal length of the first lens.