Image pickup lens, image pickup apparatus, mobile terminal, and method for manufacturing image pickup lens

An image pickup lens comprising:

• at least three lens blocks each comprising
• a lens substrate being a parallel flat plate, and
• a lens or lenses, having a positive or negative power, being connected to at least one of an object-side surface and an image-side surface of the lens substrate,
• wherein the lens or lenses included in each of the lens blocks, is formed of a different material from the lens substrate,
• a first lens block which is one of the lens blocks arranged at a closest position to an object side, has a positive power,
• a second lens block which is another of the lens blocks arranged at an image side of the first lens block has a negative power, and
• the image pickup lens satisfies the following expression (G1):
• 0.7<f[BK1]/f[all]<1.0 (G1)
• where f[BK1 ] is a composite focal length of the first lens block, and
• f[all] is a composite focal length of a total system of the image pickup lens.