An information recording medium containing, in a predetermined region, recording parameters which are for pulse sequences for forming recording marks in accordance with recording information, the pulse sequences including: pulse sequences respectively forming recording marks of a first predetermined recording mark length through a maximum recording mark length, each of the pulse sequences including: a top section including a top pulse; a last section including a last pulse and a cooling period; and an intermediate section including an intermediate period provided between the top section and the last section; and pulse sequences respectively forming recording marks of a recording mark length shorter than the first predetermined recording mark length through a minimum recording mark length, each of the pulse sequences including: a top section (dTtop, Ttop) including a top pulse; and a last section including no last pulse and a cooling period, each of the pulse sequences being expressed by time and power of a recording pulse, the power including recording power, space power, intermediate power and cooling power, the recording power of the recording pulse of either the top section or the last section having a highest value and the cooling power having a lowest value, heat of front edges of the recording marks being controlled by recording parameters for the top sections (dTtop, Ttop), wherein the recording parameters for the top sections (dTtop, Ttop) are classified in accordance with at least recording mark lengths out of the recording information, and, among the recording parameters for the top sections (dTtop, Ttop), recording parameters for top sections of the first predetermined recording mark length through the maximum recording mark length are classified into a same group, heat of rear edges of the recording marks being controlled by recording parameters for the last sections (T1p, dT1p, dTe), wherein the recording parameters for the last sections are classified in accordance with at least recording mark lengths out of the recording information, and, among the recording parameters for the last sections (T1p, dT1p, dTe), recording parameters for last sections of a second predetermined recording mark length through the maximum recording mark length are classified into a same group, and the second predetermined recording mark length being longer than the first predetermined recording mark length, wherein among the recording parameters for the last sections (T1p, dT1p, dTe), recording parameters for last sections (T1p, dT1p, dTe) of recording mark lengths each of which is equal to or longer than the first predetermined recording mark length are classified into (a) a group for a recording mark length which is equal to the first predetermined recording mark length and (b) another group for a recording mark length which is longer than the first predetermined recording mark length; and wherein a value set for a recording parameter for a last section of the recording mark length which is longer than the first predetermined recording mark length is different from a value set for the recording parameter for a last section of the recording mark length which is equal to the first predetermined recording mark length. pulse sequences respectively forming recording marks of a first predetermined recording mark length through a maximum recording mark length, each of the pulse sequences including: a top section including a top pulse; a last section including a last pulse and a cooling period; and an intermediate section including an intermediate period provided between the top section and the last section; and pulse sequences respectively forming recording marks of a recording mark length shorter than the first predetermined recording mark length through a minimum recording mark length, each of the pulse sequences including: a top section (dTtop, Ttop) including a top pulse; and a last section including no last pulse and a cooling period,