Chip resistor and electronic circuit device

A chip resistor comprising:

• an insulating substrate having a front surface, a back surface on an opposite side of the insulating substrate from the front surface, a first end surface connected to the front surface and the back surface, and a second end surface on an opposite side of the insulating substrate from the first end surface;
• a resistor layer disposed over the front surface;
• a first electrode connected to the resistor layer;
• and
• a second electrode connected to the resistor layer,
• wherein the first end surface and the second end surface are spaced apart from each other in a direction in which the first electrode and the second electrode are spaced apart from each other,
• wherein the first electrode includes a first back surface electrode disposed over the back surface and electrically connected to the resistor layer,
• wherein the second electrode includes a second back surface electrode disposed over the back surface and electrically connected to the resistor layer,
• wherein a ratio of a sum of a first area of the first back surface electrode and a second area of the second back surface electrode to an area of the back surface is 31% or more, and
• wherein each of a first length of the first back surface electrode in the direction and a second length of the second back surface electrode in the direction is 0.8 mm or more.