Although the Japan Atherosclerosis Society guideline for the diagnosis and prevention of atherosclerosis cardiovascular diseases for the Japanese population provides targets for low-density lipoprotein (LDL) cholesterol, triglycerides, and high-density lipoprotein (HDL) cholesterol to prevent cardiovascular disease in patients with dyslipidemia, there is no guideline specifically targeting the treatment of type b dyslipidemia, which is one of the most common types of dyslipidemia, along with type a and type dyslipidemia. Type b dyslipidemia is important because it sometimes accompanies atherogenic lipid profiles, such as small, dense LDL, remnants, low HDL cholesterolemia. It is also associated with type 2 diabetes mellitus, metabolic syndrome, and chronic kidney disease (CKD), and most patients with familial combined hyperlipidemia (FCHL) show this phenotype; therefore, it is assumed that patients with type b dyslipidemia have a high risk for cardiovascular disease. Thus, the management of type b dyslipidemia is very important for the prevention of cardiovascular disease, so we have attempted to provide a guideline for the management of type b dyslipidemia.