Camera optical lens

A camera optical lens, comprising:

• six lenses, being sequentially from an object side to an image side, comprising:
• 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;
• a fifth lens having a positive refractive power;
• and
• a sixth lens having a negative refractive power;
• wherein, a center curvature radius of an image side surface of the second lens is denoted as R4, a center curvature radius of an object side surface of the fourth lens is denoted as R7, a center curvature radius of an image side surface of the fourth lens is denoted as R8, an on-axis thickness of the first lens is denoted as d1, an on-axis thickness of the second lens is denoted as d3, an on-axis distance, from the image side surface of the fourth lens to an object side surface of the fifth lens, is denoted as d8, an on-axis thickness of the fifth lens is denoted as d9, and the camera optical lens satisfies following relationships:
• −3.50≤R4/R7≤−1.00;
• 3.00≤d1/d3≤5.00;
• 0.40≤d8/d9≤0.80;
• −15.00≤(R7+R8)/(R7−R8)≤−5.00.