A catalyst for producing unsaturated aldehyde and unsaturated carboxylic acid, wherein the catalyst comprises Mo, Bi, Co, Ni and Fe, the cumulative pore volume of pores having a pore diameter of 1 μm or more and 100 μm or less, in the catalyst, is 0.12 ml/g or more and 0.19 ml/g or less, and the ratio (A/B) of the cumulative pore volume to the cumulative pore volume of pores having a pore diameter of 1 μm or more and 100 μm or less, in a pulverized product not passing through a mesh opening of 3.36 mm (Tyler 6 mesh), in a pulverized product obtained by pulverization of the catalyst under a pulverization condition A is 0.30 or more and 0.87 or less; Pulverization condition A one hundred g of the catalyst is charged into a tumbling granulator which comprises a cylindrical body vertically secured and a disk horizontally disposed at a lower end of the cylindrical body and which allows for rotation movement and revolution movement of a particle by rotation of the disk around the center of the cylindrical body, operation of the disk is started at a relative centrifugal acceleration of 12 G and accelerated to a relative centrifugal acceleration of 130 G over 1 minute, and rotation of the disk is continued at a relative centrifugal acceleration of 130 G for 2 minutes; wherein the relative centrifugal acceleration is defined as a numerical value expressed as the ratio of the magnitude of a centrifugal force applied to a unit weight of the catalyst, to gravity acceleration, and is represented by the following Equation: F = 1118 × r × N 2 × 10 − 8 F: relative centrifugal acceleration, r: distance (cm) from center of rotation to lower end of cylindrical body, N: rate of rotation (rpm), wherein the cumulative pore volume is measured according to a mercury intrusion technique, including subjecting a sample to a decompression treatment under reduced pressure of 50 μmHg or less for 10 minutes, then measuring a mercury intrusion exit curve. the catalyst comprises Mo, Bi, Co, Ni and Fe, the cumulative pore volume of pores having a pore diameter of 1 μm or more and 100 μm or less, in the catalyst, is 0.12 ml/g or more and 0.19 ml/g or less, and the ratio (A/B) of the cumulative pore volume to the cumulative pore volume of pores having a pore diameter of 1 μm or more and 100 μm or less, in a pulverized product not passing through a mesh opening of 3.36 mm (Tyler 6 mesh), in a pulverized product obtained by pulverization of the catalyst under a pulverization condition A is 0.30 or more and 0.87 or less; Pulverization condition A one hundred g of the catalyst is charged into a tumbling granulator which comprises a cylindrical body vertically secured and a disk horizontally disposed at a lower end of the cylindrical body and which allows for rotation movement and revolution movement of a particle by rotation of the disk around the center of the cylindrical body, operation of the disk is started at a relative centrifugal acceleration of 12 G and accelerated to a relative centrifugal acceleration of 130 G over 1 minute, and rotation of the disk is continued at a relative centrifugal acceleration of 130 G for 2 minutes; wherein the relative centrifugal acceleration is defined as a numerical value expressed as the ratio of the magnitude of a centrifugal force applied to a unit weight of the catalyst, to gravity acceleration, and is represented by the following Equation: F = 1118 × r × N 2 × 10 − 8 F: relative centrifugal acceleration, r: distance (cm) from center of rotation to lower end of cylindrical body, N: rate of rotation (rpm), wherein F: relative centrifugal acceleration, r: distance (cm) from center of rotation to lower end of cylindrical body, N: rate of rotation (rpm), wherein the cumulative pore volume is measured according to a mercury intrusion technique, including subjecting a sample to a decompression treatment under reduced pressure of 50 μmHg or less for 10 minutes, then measuring a mercury intrusion exit curve.