In order to provide the fixed structure for being able to carry out size reduction, there is high connection reliability, an image pick-up device and an endoscope. Fixed structure of the invention is characterized in that being provided with an electronic component 55 have a prismatic shape, has electrode 55a-1,55a-2 on both ends in a longitudinal direction It is provided with a pair of of soil 60-1, a laminate 46 of 60-2 installs electronic component 55 using a solder 58 on it. Fixed structure is further characterized in that: each soil 60-1,60-2 have two regions 601,602 of different temperature ratios per unit time The region 601 for growth rate of having a high fever is set except a region, and wherein electronic component 55 is mainly placed.
