Provided is an endoscope configured so that the diameter of an insertion section is reduced and high image quality is obtained. An endoscope is provided with: an imaging unit disposed at the distal end of an insertion section adapted to be inserted into the body of a subject； and a built-in component disposed at the distal end so as to be located next to the imaging unit and extending substantially parallel to the axial direction of the insertion section. The endoscope is characterized in that: the imaging unit has a solid-state imaging element having a light-receiving section and also has a hard substrate, which is electrically connected to the solid-state imaging element and at least a portion of which is disposed closer to the proximal end side of the endoscope than the solid-state imaging element； the hard substrate has a first surface having a longitudinal axis extending in the axial direction of the distal end, and also has a second surface substantially parallelly facing the first surface, the first surface and the second surface being configured so that, in a cross-section normal to the longitudinal direction, the width of the first surface is greater than the width of the second surface； and the hard substrate is configured so that a third surface and a fourth surface thereof face the built-in component, the third surface and the fourth surface being different from the first surface and the second surface and extending in the axial direction of the distal end.La présente invention concerne un endoscope conçu de telle sorte que le diamètre d'une section d'insertion est réduit et une image de haute qualité est obtenue. Un endoscope est pourvu : d'une unité d'imagerie disposée au niveau de l'extrémité distale d'une section d'insertion conçue pour être insérée dans le corps d'un sujet ； et d'un composant intégré disposé au niveau de l'extrémité distale de manière à être situé à côté de l'unité d'imagerie et s'étendant sensiblement parallèle à la direction axial
