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diff --git a/tiger-compiler/src/ast/op-exp.hh b/tiger-compiler/src/ast/op-exp.hh
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+/**
+ ** \file ast/op-exp.hh
+ ** \brief Declaration of ast::OpExp.
+ */
+
+#pragma once
+
+#include <unordered_map>
+#include <ast/exp.hh>
+
+namespace ast
+{
+  /// OpExp.
+  class OpExp : public Exp
+  {
+  public:
+    /// Operator qualifier.
+    enum class Oper
+    {
+      // Arithmetics.
+      /** \brief "+" */ add,
+      /** \brief "-" */ sub,
+      /** \brief "*" */ mul,
+      /** \brief "/" */ div,
+
+      // Comparison.
+      /** \brief "=" */ eq,
+      /** \brief "<>" */ ne,
+      /** \brief "<" */ lt,
+      /** \brief "<=" */ le,
+      /** \brief ">" */ gt,
+      /** \brief ">=" */ ge
+    };
+
+  public:
+    /** \name Ctor & dtor.
+     ** \{ */
+    /// Construct an OpExp node.
+    OpExp(const Location& location, Exp* left, OpExp::Oper oper, Exp* right);
+    OpExp(const OpExp&) = delete;
+    OpExp& operator=(const OpExp&) = delete;
+    /// Destroy an OpExp node.
+    ~OpExp() override;
+    /** \} */
+
+    /// \name Visitors entry point.
+    /// \{ */
+    /// Accept a const visitor \a v.
+    void accept(ConstVisitor& v) const override;
+    /// Accept a non-const visitor \a v.
+    void accept(Visitor& v) override;
+    /// \}
+
+    /** \name Accessors.
+     ** \{ */
+    /// Return left operand.
+    const Exp& left_get() const;
+    /// Return left operand.
+    Exp& left_get();
+    /// Return operator.
+    OpExp::Oper oper_get() const;
+    /// Return right operand.
+    const Exp& right_get() const;
+    /// Return right operand.
+    Exp& right_get();
+    /** \} */
+
+  protected:
+    /// Left operand.
+    Exp* left_;
+    /// Operator.
+    OpExp::Oper oper_;
+    /// Right operand.
+    Exp* right_;
+  };
+} // namespace ast
+
+// Return a representation of an operator.
+std::string str(ast::OpExp::Oper oper);
+#include <ast/op-exp.hxx>